Bulldog Upgrades.1

Part 1

http://www.drilldogbigborepellets.com/p/bulldog.html


This page is related to a few upgrades added to our Bulldog, and if something else comes along the way we will add it here. 

For the Sam Yang Recluse the upgrades can be seen here:
http://www.drilldogbigborepellets.com/p/recluse-upgrades.html

***

These big bore air rifles are fun to shoot; be for target practice, competition, or whatever you decide; however, they are not quiet ones, due to the much needed air in order to propel a .357 slug as the DrillDog Big Bore Pellets up to 900 fps.

In the beginning we looked for a moderator to see if it was possible to shoot this galactic rifle in our backyard; but there was not one, till pitbull-airguns decided to make a plastic one in a 3D printer. Plastic does not mean cheap, as it cost $200 American dollars. At that point nobody made any for the Bulldog, or even an adapter for an external one.


Before going further with the mega moderator, as it is called, let's talk about the noise or ping you hear in your ears (right or left) when shooting the Benjamin Bulldog Air-rifle.


This rifle has a terrible ping-sound. To completely remove that noise I added inside the air reservoir a home made Depinger using a Walmart .98 cents toilet brush. As you see in the picture I did it a little different than others. I heard complaints from people who made similar ones, about that some of the brush 'hairs' could get loose with time under pressure. Taking that in account I melted the corners and it became a kind of stop or seal which will prevent that from happening. Others mention that as time goes on the brush could move from the cente
r of the reservoir to the sides, mostly toward the back. Well I did not cut off the metal wire on the sides of the brush, but decided to keep it in a such way that if it moves, then it will stop still at a right working distance. In the final product the brush itself (plastic strands) is 3 inches long. One tip of the wires has a form of a hook so you could remove it easily if wanted, by pulling it out with something else from outside. So far it has worked as a champion.



Original type of Toilet Brush before trasformation:

http://www.drilldogbigborepellets.com/p/bulldog.html


Brush after becoming a Depinger:

DrillDog Depinger at http://www.drilldogbigborepellets.com/p/bulldog.html

~ & ~
Now, going back to the moderator. First we are not advertising the pitbull moderator. We even do not know the guy, and we had to pay as anybody else. I will answer here a question people asked me when they saw my moderator. It is worth it? Is is worth the price? They think it is expensive, and it is indeed!...for a plastic item made in a 3D printer to be used in harsh environments, be in the forest, hunting, or playing around, it is much expensive; but he has no competition. When there is no competition, like in Socialism, you have to get what you find....no discussions.

So, for now if you want to quiet the Benjamin Bulldog up to almost backyard friendly, then you have only one choice. If you noticed I said 'backyard friendly.' It all depends where you live. If you reside in the middle of a big city you could be scaring your neighbor, unless you tell him: 'Hey bro...Now I will shoot an air rifle! Do not be scare, neither call the police! If it bothers you just plug your ears with silicone!


Well...joke apart. I do not live in the center of a city, but in the suburb, and frankly, before I was not able to use the Bulldog at home. Now, after installing the mega moderator I can.


I promise a better picture at the end of this page with the Bulldog and the  added moderator, but this is the one I have now.



http://www.drilldogbigborepellets.com/p/bulldog.html

After a month using the mega moderator in the Bulldog, my picatinny rail failed as the screws got loose with the adjustable bipod that I added into it; and it is due to the fact that it has no threads into which the screws could be attached or threaded -in, so they just go-in the plastic hole. Some glue was added to the holes but that was a temporary (3 days) fix for myself. Thus, I decided to upgrade it, and I think this problem will be resolved for the long run.

When I received my moderator I saw that on one side it was smooth, but the other side had highlight marks which protruded above the moderator's surface. You will notice that in the next pictures, and I contacted the maker, who told me this was because to guarantee strength in that part where the screws go, he had to add more material and sacrifice the pretty part with the useful one. Still my screws failed, and then I decided to sand the moderator to make it even on both faces. None of this affected the main function of the mega moderator at all.



http://www.drilldogbigborepellets.com/p/bulldog.htmlhttp://www.drilldogbigborepellets.com/p/bulldog.html

Here some sanding ready action to be painted later-on when finished. Sand on the corners as well, because it has very sharp endings, to the point that I may add a rubber cover on the moderator's tip later on in order to protect it from hitting anything. I used 240 sand paper, but you can go up to 400 if wanting it smoother. For me that was enough.

http://www.drilldogbigborepellets.com/p/bulldog.html


I went to Ace Hardware store and bought there some female metal thread inserts that had threads on the outside and inside at the same time, as you will see in the pictures. I got two 10/32 size for the picatinny rail holes, and one 8/32 thread-diameter for the hole on the top of the moderator where it contacts the metal shroud of the rifle.

Next I drilled holes in the mega moderator. Take in account that these holes will go all the way through into the inside's empty chamber, but do not worry, as later on you will tap that with the threading and screw. No matter what, even a small hole in that part of the moderator could even help in ventilating-out the gases; but in this case once the picatinny rail is installed, all will be covered again. If after drilling some material pieces get inside the moderator just take a vacuum cleaner and suck it out.

http://www.drilldogbigborepellets.com/p/bulldog.html

On the top I drilled using a 1/4 drill bit, and at the bottom (where the picatinny) with a 3/8 drill bit. You may use other inserts and different sizes, but these are the ones I could find. As you see I kept the original screw in the top, but used new ones for the picatinny rail. What you see around the holes is the old glue I had added before.

http://www.drilldogbigborepellets.com/p/bulldog.html


http://www.drilldogbigborepellets.com/p/bulldog.html

The outside thread is aggressive enough to be put without any type of bonding, but I did not wanted to take a chance and used Devcom Plastic Welder while my fingers where all dirty with glue and powder from the sanding. 

http://www.drilldogbigborepellets.com/p/bulldog.html


http://www.drilldogbigborepellets.com/p/bulldog.html

After that I inserted one by one the threads into the holes. Just prepare one at a time so the glue does not dry way too quick.
Top:
http://www.drilldogbigborepellets.com/p/bulldog.html
 Bottom:
http://www.drilldogbigborepellets.com/p/bulldog.html


http://www.drilldogbigborepellets.com/p/bulldog.html

Also added some washers to the picatinny rail itself.

http://www.drilldogbigborepellets.com/p/bulldog.html

Then I bough also, in the same store, a black painting spray just for plastic, and gave it a paint job. Actually it is still now waiting for the second hand and tomorrow, when it drys good enough (24 hrs), I will add in this page the whole picture of the rifle; but for now be happy with the hanging mega moderator once painted. Of course, I covered the thread holes with electric tape, so no paint could go inside guming the insides.


http://www.drilldogbigborepellets.com/p/bulldog.htmlhttp://www.drilldogbigborepellets.com/p/bulldog.html

~ & ~
Another thing I added to the Benjamin Bulldog are barrel supports (and a single shot tray) made by pitbull too; and again, like in Socialism no competition so far, nobody else produce it; maybe from hard rubber to damp vibrations. Who will be the next good Capitalist we could admire with his innovative ideas brought to the Bulldog's market? The reality is that my Bulldog from the beginning, it its factory condition, has been accurate enough for a .357 caliber air-rifle. Said that, I am not sure that I gain too much accuracy with these supports, but certainly did not lose any. 

This picture taken from pitbull differs a little bit from the ones I received, which on the inside had more triangular openings, but basically is the same thing and function; and I forgot to take a picture of mines. Maybe in the future if I dismantle the rifle again. However, update December 2018=> Before buying these ones check the failed results we had after a few months, go to Bulldog Upgrades Part 4 page and scroll down there:  http://www.drilldogbigborepellets.com/p/bulldog-upgrades4.html

http://www.drilldogbigborepellets.com/p/bulldog.html

Single shot tray we used in the Bulldog, made by pitbull airguns.

http://www.drilldogbigborepellets.com/p/bulldog.html

~ & ~
Other thing you can do to your rifle if wanting to gain a little of speed, maybe 10 fps or more, is adding a washer behind the hammer spring, inside its cap (item #24). If after doing that it takes to much effort to cock the gun, then just remove the same thickness size of the washer (shim) you added, to the tip of the plastic guide inside the spring (item # 23). We also polished the hammer a little bit in its entirety. Another thing that can give you some more speed is by removing the Plastic Sleeve in the Transfer Port (TP), item # 30 in the Bulldog's Crosman Diagram, but I did not do it; nevertheless will try it in the near future, or next time I dissemble the rifle. Also never decided on drilling and opening the TP, because we may add more speed but it will spend more air as well; and I intend to keep it as such because it is good to have 10 full good shots and not just five. Others have done it but also replaced the factory reservoir with a larger one capacity that is used for the Pioneer Air-Bow-Rifle; but the outcome is not more shots, just more speed. Take in account that pressure in the system will be increased as well. 

Some people said that by removing the cone-spring in the valve they have gained like 20 fps. I did not remove it but replaced it with one similar but a hair shorter and with less tension; and the truth is that I do not think that it is necessary or we will notice any major difference, just did it to help in the overall advancement. Removing that spring completely is not the best idea, because it keeps the valve close when there is not much air in the reservoir and that way you can refill the tank from any position. The hammer spring can be adjusted from the back of the rifle. If you turn it in, let's say, all the way inside, then 3 full turns in reverse (back), it will stay in a positive position for a good rapid start.

~ & ~
As for the trigger you can adjust it (shortening first stage) from outside by removing item #10, Trigger Adjustment Cover; and I myself added two very small washers on each side of the trigger and this way I completely eliminated any lateral movement it had which bothered me. For that you need to take the trigger apart, put it out from the pin that holds it, add a washer first, then the trigger, then the second washer.... Done! The washers (like shims) can be polished before installation to make them smoother, and you can cover them with a little of silicone grease.

Now is done!

http://www.drilldogbigborepellets.com/p/bulldog.html


Happy target practicing!

Till next...


-----AFTER----

Once writing all of this and taken the Bulldog with its mega moderator for a day of target practicing, after 50 shots it gave up on me. It works well, but as seen in this picture, the plastic material at some point could knuckle under a .357 caliber pounding. 

If the moderator was made from aluminum that problem was resolved and everybody was happy; however, we can think that due to the special shroud of the bulldog, this same moderator, to be made of aluminum, requires a financial investment that can be a heavy burden for just one person. It needs the help of a company as Crosman, with ample resources. 

Doubtedly it can happens... but who knows, as the idea came from a single independent citizen. Again, this moderator is a great idea and has potential (88.8 db in a .357 cal.); but it needs a more durable material and aluminum will be best, because is light. It could be made as an entire part, or consisting of two separate parts.

I needed a moderator for the Benjamin Buldog to be used in a close to urban project I have. Said that we contacted well known air-rifle moderator manufacturers who have been making them for years. We presented this one to them from pictures and published youtube videos, although we never had believed much in those; and they told us directly that a 3D printed plastic moderator for a .357 cal. will not hold much pounding at some point + they told us that it was overpriced... still I needed it, and nobody has made one for sale in many years after the Benjamin Bulldog came out to the Market.

In that sense, due to the nature of this one and difficulty of making a moderator that is not round, we need to thank Pitbull-airguns, as he was the one, after a long waiting, who came with the idea, thus providing all users of this particular rifle, with a way to calm down the Bulldog for a given time.

http://www.drilldogbigborepellets.com/p/bulldog.html

Here a picture of the Mega Moderator after giving up.

~ & ~

Pitbull airguns has sent us a new replacement which should have addressed the concern of adding more material in the front at least. We will try the next one that is coming in the mail soon. Of course, this time we will not use it for plinking or long shooting sessions, but just when is needed for real action.

I just dissembled the Bulldog again, removed the Plastic Sleeve in the Transfer Port (TP), item # 30 in the Bulldog's Crosman Diagram, and drilled on the TP, opening it up to 1/4 (drill-bit). If improvement in the form of more speed comes as the result, without sacrificing 10 good shots, then I will post it all over as we did with the factory one using our Bulldog and DrillDog Big Bore Pellets FPS/FPE only. Hopefully we will reach the amount of speed vs. shot count-relation without having to drill the valve as well.
~ & ~

We took the Bulldog to the Range after drilling 1/4 diameter in the TP, and removing the Plastic Sleeve. The results? No much difference.

On some pellets I gained a few fps over the factory condition, on others not at all or down a little; adding that in our 162 and 164 grains (this one specifically) test, we had some jamming after the first six shots, making the rifle, for this round-nose with long body, like a six shot rifle on heavier pellets. Take in account that these are also .358 cal., which are pretty tight for the Bulldog + they are long; and the barrel twist of this rifle is 1:14, which always will favorite the shorter slugs. I will probably post all the info. It was today and I wrote each shot; nevertheless, before posting it I want to recheck everything but this time maybe putting back the Plastic Sleeve with the already drilled TP.

For the time being I have no intention to open the TP even more than 1/4, but may drill on the valve a little bit, because this probably will increase the speed meaningfully, nevertheless risking to have in all slugs only 5-7 good shots when crossing over to 128 gr. That's not a bad idea, as I used to prefer having 10 good shots with all of them; but now I think trying is worth for a higher power, because this is a .357 cal., intended for hunting.

The factory condition is still good for this rifle as it was designed for 10 steady shots. I do not see an overwhelming improvement so far. I thought it first, but when comparing right now the results that I had before drilling the TP to 1/4, actually do not see much of a recommendation; due to the remaining of the valve with the same opening. It may change, as said, if we drill on the valve as well another 1/4 there.

As you can see here: Bulldog FPS / FPE, when we took all the data from its factory condition; we were able even to shoot up to 20 shots. Not good ones after the 10th, but shots anyway. Now as the TP is bigger, but the valve's hole is the same, when reaching 10 shots, there is no purpose in going further, as you risk to have jammed ones. It means that drilling on the TP without doing the same in the valve will not bring up the speed with efficiency, because now the valve is sending the same amount of air to a bigger channel and TP. We thus need more air from the valve to really notice that fps increase with substantiation.

I will take next time some pictures when dissembling the rifle again, and drilling; then doing a second page in this site for the Bulldog's upgrades, because this one is getting way too long to scroll down.

Any big bore air rifle shooting 5-10 good shots, is more than good; and usually you use the heaviest ones in specific circumstances, not always. Those ten shots we now tested went from 3000 to 1800 psi. As said, if putting back the Plastic Sleeve we removed, without yet drilling on the valve, we may have different results after tightening more the hammer spring, or replacing it with a stronger one.

I may try that one soon, but also could go straight and drill on the valve. Or do all things combined before the test. Once we drill all TPs, then we need to play with the Hammer Spring, to make it hit a little bit harder on the valve, thus sending more air towards the barrel, as then the openings will be much wider.

It takes time going to the Range because the lack of a moderator to test all at home.

&

Also installed my second Pitbull Mega Moderator that was sent as replacement; and to tell you the truth, it was affecting the rifle's accuracy. So I will recheck it to see if I can modify something. I thing it was moving the barrel up a little bit where it engages it, as all the shots were well high towards the right side, no matter how we adjusted the scope trying to help. After removing it and put everything back as the factory condition, accuracy came back with no issues; so there is something there after installing the moderator, and we will find out.

&

Day after. We decided to cut-off the moderator's part where it engages the barrel and keep the factory baffle, which is a support as well. For that I needed to measure where to cut; so, when installing it back both (barrel-support and moderator) will not hit one another.

The white line you see in the moderator is where the cut was performed. Check next pictures.

Barrel (left) and Moderator (right). The barrel shows it's factory support-baffle in the tip; and on the Moderator the part that should replace it, as it was instructed by its maker.

http://www.drilldogbigborepellets.com/p/bulldog.html

http://www.drilldogbigborepellets.com/p/bulldog.html

You see in these two next pictures the part of the Moderator that was cut off. Now the rifle keeps its factory support, and it should stay in-line with the Moderator as it runs inside the shroud.

http://www.drilldogbigborepellets.com/p/bulldog.html

http://www.drilldogbigborepellets.com/p/bulldog.html

We had no time to re-check accuracy. Just did 5 shots to make sure the slug goes out without any major problem; and it seems we did not have any surprise so far. I will be dissembling the rifle and working on the Bulldog's valve, to drill in it; thus accuracy test will take a few days ahead.

April, 2018.

For Part 4 of Bulldog's suppressor upgrades go to:

For Part 2 of the Bulldog's upgrades with a new complete Tune-up, can be read here:


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