Wessir

Great day on the range! I bought this JP Enterprises 2 piece adjustable gas block. I have a one piece adjustable gas block on my AR15 and it definitely works but you can't see inside it and you have to take the muzzle brake off to take the gas block off so I wanted a two piece so I can clean this without removing the muzzle brake. The JP two piece has a detent instead of a brass locking screw so that's a major plus. You hear it and feel it click click click every 1/4 turn. You can see it is easily adjusted through the side of my handguard. I set it at 3.75 turns for the Nickel Boron BCG and two Tungsten weights on the silent capture spring. You can see that gas block opening is reduced about 40% at that setting. I have the 3 spring builder pack and all 3 work the same, I can't tell any difference and didn't need to change the gas adjustment when switching between the different springs. I'm running the heaviest of the three because I think it helps to slam the bolt closed a little more reliably. Just guessing though I really can't tell one from the other. Today it cycled perfectly on Tula Steel case 150 grain, 145 grain FMJ NATO 7.61, and 180 grain Remington Core-Lokt. Like butter. I'm still curious how much mass others are moving. I'm scratching my head about the new trendy mass reductions to supposedly reduce recoil.

Thanks, so far Brownells looks to have the best selection and descent price.

I just got a nickel boron bcg and it isn't the same weight as my nitride bcg. I don't have an adjustable gas block yet so it was running open on a .092" gas hole with a 4.8 ounce buffer. I use ammo from 145 grain up to 180 grain. Cycling seemed ok but I can't tell if bottoms out (over gassed). It always locks back on empty magazine. Gas tube is rifle length 15.125" on the 20" barrel. 7" dwell. Nickel boron bcg is 1 pound, 2.5 ounces. Nitride bcg is 1 pound, 2 ounces. 4.5" of travel on the JP silent captured assy. The bolt clears the bolt catch by a good 1/2" before bottoming out. I use the heavy JP spring (yellow/red). What is the weight of your bcg and buffer? Length of gas tube/dwell? Does it run light and heavy grain bullets equally well? Did you have to change the buffer spring and weight to get there?

I'm asking where to buy these small components. The extractor roll pin is of most interest at the moment. Every time I take it out to clean the bolt it is a little less tight than before. I would guess the same for any roll pin.

Where is everyone getting roll pins and cotter pins from? I can't see paying a lot for these tiny things... Looking for bolt pins and bcg cotter pin.

PSA AR-15 magazine wall is built up to keep that from happening. Good idea don't know why they didn't do that for the AR-10.

@shooterrex Here's the other side, not much to see. It's all the way down as far as it can go I even removed the bolt catch to spin it down. Maybe the PSA made mag release is thicker in some parts to keep it pushing through.

@98Z5V fyi from the Aero site. And here's a pic of that mag catch that might be the problem. There isn't much to hold it in either, it is tightened as far as possible and I still push it through when releasing it.

Quite by accident I realized the magazine isn't sitting in the well properly. There is a lot of forward and backward slop which changes the angle the rounds are feeding toward the barrel. When I release the bolt catch with my left hand I'm naturally pushing the magazine forward and that is why it chambers the round properly. When I'm shooting, the magazine is hanging free and at that angle the bullet is stopped at the magazine well and the back end of the cartridge is then forced into the magazine. It is exactly what it looks like. That's an easy thing to check for and see with your eyes. Hope that info helps somebody out someday. Palmetto State Armory lower seems to be the real problem. Maybe the magazine catch from the Aero M5 parts kit isn't just right for it. Maybe something else about it. My PSA AR-15 lower works perfectly so I'm not wanting to throw stones at PSA but the least they could do is have the lower parts kit in stock to match with it? It really seems like the lower might be a paperweight without the exact matching parts from PSA. I am seeing an Aero M5 lower available now so I guess I'm buying that and go from there. At least with that my pivot pin will fit the way it is supposed to.

It mostly does this when firing. When I pull back the bolt and use the bolt catch to hold it, then put in the magazine, then release the bolt catch it chambers a round and the bolt locks, ready to fire. It has only jammed that way once or twice. I may only have 50 rounds through it so far. The second round, gas cycled, is the opposite. 9 out of 10 times it is jammed.

I'm using ptfe for lube on the bcg. Feels smooth and slippery even though it isn't 'dripping'. Is the thought short stroking? Aero lower parts kit on a PSA lower, that is why the front pin sticks out. Otherwise it does fit and is secure but it does stick out. I bought the upper from Moriarti Arms. It isn't labeled who manufactured the bcg and upper receiver. It chambers rounds properly from the locked back position and releasing the bolt catch. It locks back on an empty magazine as well. Magazines seat well. .308/7.62 20" Ballistics Advantage barrel. I built an AR-15 and used an adjustable gas block. It works perfectly, very boring. I did this one knowing it would be a bigger challenge because of lack of standards. I'll check the gas block again, does this kind of jamming indicate short stroke?

I'm sure this topic comes up a lot but I haven't found the answer yet. Hoping for some tips here. Chambering the first round by releasing the bolt catch from a charged position it works 90% of the time. The other 10% the bolt ends up somewhere on the side of the casing like the picture. The second round 99% of the time will jam the same way. The bolt coming down on the casing somewhere (usually at the bottom near the primer). I ground and polished the feed ramps on the Ballistics Advantage barrel. I checked the non adjustable gas block for proper position. With a chambered round and an empty magazine it locks back every time. I have tried different spring weights in the JP Silent Captured Spring. I've used 3 different brands of ammo. I tried 3 different brand new PMAG magazines. It appears the round gets caught up when coming forward and the casing is pushed back into the magazine as the bolt moves forward. Is it really getting caught up on something? Is the bolt moving around too much inside the upper receiver? Those are the only parts that don't have some company name on them.

Interesting hadn’t thought about it much. Now I’m thinking and looking for it.

The charging handle? Good eye! That was the last piece to arrive. This pic taken just before. Had to raise the scope also to operate it.

Ballistics Advantage barrel with a Hyperfire mod-2 trigger and JP silent captured spring buffer. The muzzle brake and F.A.B. shock absorbing stock cut the recoil in half. Hogue rubber grip feels perfect. The rest pretty standard nitride and aluminum.

Hi all! Not likely to find myself on a range or otherwise able to meet other enthusiasts so here I am. I have watched a lot of YouTube videos to get started but now looking for more specifics. After several decades of NOT having guns I decided to pick up the hobby again. Pretty poor timing given the Coronavirus problem. It’s been like Christmas waiting for each part to arrive. After three months I finally got a few rounds through my newly assembled 308! Happy to be in the club with all of you :)