AR pistol issues

[blindman]

hi guys, i'm running into a little issue with my pistol and wanted some opinions on what the possible problem could be. this was a budget build so i know the parts could have been better.

issue is the gun doesn't always go into full battery. i'm running a 7.5" wylde barrel. ammo used are reloads, but have been headspace guaged prior to reloading. once fired the brass is ejecting to the 4/5 o'clock position around 5-7' out. swapping the bcg into my rifle functions fine. moving my rifle bcg to the pistol also has battery problems. bcg moves fine without a round in the gun. i'm thinking it may be the barrel, but wanted some opinions before i shell out for another barrel.

[LeadFarmer74]

Look into the barrel and buffer assembly.

[skyungjae]

You might wanna pull the buffer and spring from your rifle and swap that out to see if it helps. This is assuming you're using a pistol tube which uses a carbine spring and buffer and you're rifle is also running a carbine spring and buffer.

[blindman]

Look into the barrel and buffer assembly.

You might wanna pull the buffer and spring from your rifle and swap that out to see if it helps. This is assuming you're using a pistol tube which uses a carbine spring and buffer and you're rifle is also running a carbine spring and buffer.

thanks. i'll try swapping out the spring and buffer.

[Chunky_lover]

I had a cheap kit where the tube was actually 1/4 shorter then other tubes I had bought
so that was enough to keep the bolt from going back far enough
once that was changed, and at the same time my buffer was falling apart I put in a H buffer that solved any issues I had


if you have another tube laying around like on a rifle measure the inside depth
and compare to your pistol
see if its shorter


my only issue was bolt not locking back 100% of the time on empty mag using that shorter buffer tube

[skyungjae]

I actually had short stroking issues with this build back from 2009. I swapped out the STT2 buffer with a standard buffer and it ran flawlessly after that.

People often underestimate how crucial the buffer/spring set up is on the AR platform.

[blindman]

Should I look at the h or the h2 buffer? I know I know buy both. Just trying not to spend extra if I don't have to

[LeadFarmer74]

Should I look at the h or the h2 buffer? I know I know buy both. Just trying not to spend extra if I don't have to

I run a h2 in my 11.5.

[3rd_gear]

I ran an h2 in my 11.5. With 5.56 and full power 223, like Hornady TAP, it was flawless. With budget 223 ammo, I had FTE or FTF every time. I switched to a normal buffer and now everything runs fine, except that brass is thrown out very far.
Figured out that my gas port was too big for normal buffer and not big enough for h2, unless only shooting 5.56.

[Calico1404]

Make sure your buffer take the bolt. Spring and buffer weight all the way past your bolt catch. I took my pistol out and realized i wasnt cyclying far enough back forna full forward slam. My buffer tube was hollowed short. Take off your lower push your bolt into your buffer all the way back. See where you sit. X's 2 on chuckys comment

[blindman]

ok. got home a little while ago and finally had a chance to look at the spring and buffer. measured the inside of both tubes and they both measured 7" deep. weighed both buffers at 3.0 each and the same length. now the spring is a different story. black is the pistol spring

[Tere_Hanges]

Did you clean and lube the BCG real good? If its a NiB, they can be sticky if you dont lube em up first.

[blindman]

Did you clean and lube the BCG real good? If its a NiB, they can be sticky if you dont lube em up first.

bcg is fine. tried it in my rifle without any issues and moved my rifle's bcg to the pistol and still had issues

[skyungjae]

I'd try trading springs and see how that goes... then hit up some of those downhill trails with the visiting WC teams.

[WRXKid]

looks like Chinese spring? I used an Ebay buffer tube and spring and had the exact same problem. The buffer tube was actually a tit hair too long and the upper wouldn't go into full lock. I had to shave the buffer tube down to clear the upper. Doing that made the buffer drag slightly against the tube (stupid burrs) and slow the BCG down enough keep the round out of battery. Imagine how long that took to figure out.
From what it sounds like, it's probably a buffer kit thing and not the barrel or BCG.