Suppressors Failure to feed w/ HD Buffer

[txdrhuntr]

Had a failure to feed issue with my Bushy XM15 after attaching a YHM Phantom. Some of the rounds would not feed properly and the bolt failed to go into battery. Tried a variety of ammunition and after searching this forum, it appeared the answer should have been a heavy duty buffer. I also checked the alignment of the gas port on the YHM sight base. The gas port alignment seemed fine (no half moon gas ring on the base. I recentered the sight base and purchased a Spikes T-2 HD buffer.

That seemed to do the trick as long as the suppressor is attached. Now, I am havig feeding issues when the supressor is not attached. Tried a variety of factory and hand loads. My basic plinking round is a Hornady V Max Bullet with 27 grains of IMR 4920 (don't have the can in front of me as I type this). I also tried Hornady JHP 68 gr bullets with 25 gr of the same powder as well as PMC factory 55 gr JHP loads.

I did not change the buffer spring just the buffer. Now I get double feeds and failure to feed on almost every round when the suppressor is not attached.

Should I go to a larger round w/ more powder or change the spring? Any suggestions?

 

[Chucky]

Re: Failure to feed w/ HD Buffer

You might want to try running an adjustable gas block then.

 

[jheat308]

Re: Failure to feed w/ HD Buffer

Sell the bushy and be done with it. Get into a better platform and you should be GTG without doing anything. IMO

 

[ponchair]

Re: Failure to feed w/ HD Buffer

Get a flat wire buffer spring, by David Tubb.

Tubb Spring

The buffer you purchased might be too heavy for non suppressor work. There is a green zone when it comes to AR's and pressure. It's sometimes hard to meet a balance of pressure and carrier travel. Depending on gas tube lengths etc. Mid length gas systems seem to have better feedback with suppressors, as opposed to the carbine. You might have to change the buffer each time you shoot, suppressed or not.

Bad thing about not having an adjustable gas block.

 

[RollingThunder51]

Re: Failure to feed w/ HD Buffer

..

So, a suppressor designer is given the task of designing a can for a particular round and platform. Among many things to be sure and account for is the ability of the can to insure proper and reliable operation. With a can, its all about pressures, especailly on a gas gun. Too much pressure and the bolt slams and there is a considerable amount of blow back. Too little pressure and the host will not cycle. There are a number of ways one controls pressure within a can and, as one might expect, they are used according to the anticipated final requirement....Gas operated? Full Auto? Bolt action? barrel length? Short OAL can length requirements? Types of ammunition? Purging of debris? etc? etc? etc?

You can dick around with springs and buffers and a whole host of crap. Going with an unusual barrel length? Adjustable gas is the way to go. Get a can that is designed for your application. Its really not that hard.