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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
[#1]
Baffle strikes
Link Posted: 4/16/2017 1:44:08 PM EDT
[#2]
Non concentric barrel threads.
Link Posted: 4/16/2017 2:04:42 PM EDT
[#3]
No baffle strikes
Link Posted: 4/16/2017 2:57:48 PM EDT
[#4]
DIY form1 can or is it commercial?
Link Posted: 4/16/2017 3:01:16 PM EDT
[#5]
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
[#6]
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
[#7]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
No baffle strikes
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If it's keyholing at 7 yards, the bullets are touching the baffles.
Link Posted: 4/16/2017 5:40:58 PM EDT
[#8]
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
[#9]
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
[#10]
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
[#11]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
No baffle strikes
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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
[#12]
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
[#13]
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
[#14]
Link Posted: 4/17/2017 10:08:43 AM EDT
[#15]
what does it look like when you use your suppressor alignment rod? I bet he did not use one 
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