Warning

 

Close

Confirm Action

Are you sure you wish to do this?

Confirm Cancel
BCM
Member Login

Posted: 4/16/2017 1:28:04 PM EDT
What would make a suppressor make a AR15 keyhole at 7 yards? Direct thread onto barrel. It will also make the rifle shoot bottom left of target at 50 yards. Rifle shoots dead on without the suppressor so I don't think the barrel would be causing it.



Remove suppressor, install flash hider and shoots straight and true.

A friend is having this issues.
Link Posted: 4/16/2017 1:31:40 PM EDT
Baffle strikes
Link Posted: 4/16/2017 1:44:08 PM EDT
Non concentric barrel threads.
Link Posted: 4/16/2017 2:04:42 PM EDT
No baffle strikes
Link Posted: 4/16/2017 2:57:48 PM EDT
DIY form1 can or is it commercial?
Link Posted: 4/16/2017 3:01:16 PM EDT
It's a commercial can. Don't know the brand.

I think the rifle is a older bushmaster or colt.
Link Posted: 4/16/2017 4:42:58 PM EDT
Discussion ForumsJump to Quoted PostQuote History
Quoted:
It's a commercial can. Don't know the brand.

I think the rifle is a older bushmaster or colt.
View Quote
Barrel profile? Only thing I can think of for the keyhole would be off-center, and maybe just with a hole large enough to avoid strikes. For massively changing poi, I'm wondering of the can is large enough to be weighing on the barrel.
Link Posted: 4/16/2017 5:20:22 PM EDT
Discussion ForumsJump to Quoted PostQuote History
Quoted:
No baffle strikes
View Quote
If it's keyholing at 7 yards, the bullets are touching the baffles.
Link Posted: 4/16/2017 5:40:58 PM EDT
Discussion ForumsJump to Quoted PostQuote History
Quoted:
If it's keyholing at 7 yards, the bullets are touching the baffles.
View Quote View All Quotes
View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Quoted:
No baffle strikes
If it's keyholing at 7 yards, the bullets are touching the baffles.
This
Link Posted: 4/16/2017 6:15:23 PM EDT
Way more info is needed before anyone can accurately diagnose this.

Actual manufacturer of gun AND can
Ammo
Barrel length and twist
Factory thread job or gunsmith?

This would be a good start.
Link Posted: 4/16/2017 6:28:35 PM EDT
My fluted barrel DPMS .308 was a nail-driver - until I'd put on my can. Then, it'd just go crazy.

Had to install a custom heavy barrel to fix the problem. Barrel doesn't flex even a little bit now.

I suspect that's the problem, but hey! It could be any number of factors.
Link Posted: 4/16/2017 6:44:18 PM EDT
Discussion ForumsJump to Quoted PostQuote History
Quoted:
No baffle strikes
View Quote
You are definitely getting a baffle  strike.  The severity of strikes vary, just because you're not getting a end cap strike doesn't mean it's not touching
Link Posted: 4/17/2017 1:16:51 AM EDT
If he left a crush washer on the barrel, or the shoulder of the threads were dirty you'll get this issue.

There's also the possibility of non-concentric threads, but honestly that is so rare on AR's, doubly so for well known manufacturers.

Either way:

STOP shooting the gun and take it to a smith!
Link Posted: 4/17/2017 9:34:36 AM EDT
Discussion ForumsJump to Quoted PostQuote History
Quoted:
It's a commercial can. Don't know the brand.

I think the rifle is a older bushmaster or colt.
View Quote
Early Colts had a 1:12 twist; barely stable with 55gr; not stable with heavier bullets.
Link Posted: 4/17/2017 9:39:28 AM EDT
Link Posted: 4/17/2017 10:08:43 AM EDT
what does it look like when you use your suppressor alignment rod? I bet he did not use one 
Top Top