Re: QD Suppressor for the A2 birdcage?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: KYS338</div><div class="ubbcode-body">I think they discontinued them but AAC made a model called the Omni. I have one, it was actually my first suppressor I ever bought. Its a heavy sumbitch but it works and works well. </div></div>
I understand the concept of "not optimal", but as the poster above indicates, it can work, and work well. The number one reason for dedicated mounts, is that they can be sold for profit. Some of the proprietary suppressor mounts on the market are known to provide a broader range of fits, while others are more optimal so the A2 falls somewhere in the middle.
We measured 11 A2 compensators from rifles branded Les Baer, S&W, RRA, Bushmaster, and LMT, and found that they fell into a .0015" range on the diameter between .861 and .8625" on the OD. The rear grooves were all .125-.128" wide. The print tolerates more fluctuation, but a majority of units should be acceptable for suppressor mounting. If a unit is bad, a $6 replacement is a cheap fix.
On one of those comps, mounted to a crush washer, our first model M4-SD had ~1.5MOA POI shift. Other customers have reported ~1.5MOA shift.
The best option that has not been already mentioned in the thread is the A2RA Renegade from SWR.
In all cases, the removal of the crush washer and replacement with shims or a peel washer will be best for alignment.
If you can't do that, the best thing to do would be to get a couple crush washers and re-mount the flash suppressor and check alignment until good alignment is obtained. Crush washers are sort of a roll of the dice- there is no guaranty of even crushing, but in my experience if you remount 1-3 times you should get decent alignment at least once.