Supressor on long barrel?

I prefer longer heavier barrels under most situations, the problem with them is the longer the barrel the more sever the wip will be. Adding a can will have even more of an effect. You will just have to learn the different POI with, and without the can.

Our first SR25 rifles (early 90's- before they were standard issue in the mil) had 24" barrels with KAC supressors, and boy were they long! When they were updated with 20" barrels later on (along with many other updates) we were happy campers.Also keep in mind the space taken for storage, whatever you intend to use as a transport case, etc.

So I'm looking at building out an AR possibly in 6.5 Grendel for mostly target shooting and I was wondering if there's any reason not to have supressor on a 24 inch barrel. I won't be rucking this around, so i dont care about unwieldyness or weight. I'm thinking heavy barrel, fluted. Will that keep it from probably having a POA shift from unsuppressed? I plan to handload to take advantage of the length.

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You're almost certainly going to have a POI shift with the suppressor on/off with a 24" barrel and you might even have a POI shift with a shorter barrel. One solution is to only shoot the rifle with the suppressor on.

That'll be a long gun! If it's just for use on the range and you won't be carrying it around everywhere, I don't see a reason not to put a can on it.

While there are some suppressor companies that claim to have either reduced (or even eliminated) POI shift with the can, generally you're going to have a different POI when you take off the can. For example, my 10" SBR has a 0.5-1.0" shift at 50 yards. Now on your rifle it may not be that bad, but I would count on some movement. The solution is to always shoot the rifle suppressed.

The real question is: why would you ever want to shoot the rifle unsuppressed if you have a can for it?

Telekinesis said:

That'll be a long gun!

The real question is: why would you ever want to shoot the rifle unsuppressed if you have a can for it?

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You answered your question with your first statement.

Yes you're going to have a difference in POA/POI with and without but that would be true if you had a 16" barrel too. Having the same 24" 6.5 with a suppressor though, it's worth it, if you want less noise.

I've a 20" AR rifle that has negligible POA/POI shift suppressed vs. unsuppressed at 100 yards. The only way to find out is to try it! It is unwieldy, although my wife enjoyed shooting it (quiet, very little recoil) so I built her an 18" carbine with a Magpul STR stock that fits her nicely, is heavy enough to soak up recoil, but just short enough for her to handle comfortably and its never been shot unsuppressed. Then we bought another suppressor so we can shoot side-by-side.

For your intended purpose, go for it. Silencerco Omega is nice and light, would be a good option.


I have an AAC 556SD on a 16" AR-15.

3.5 MOA shift, straight down, POI shift.

I see more POI shift with longer thinner barrels. Heavier barrels and shorter barrels seem to have less.

My shifts are all pretty consistent though, so it is not hard to keep track of it really!

I dont see any problems with what you are going to do. Go for it.

https://amtacsuppressors.com/suppressors/cqbm/
https://amtacsuppressors.com/suppressors/cqb/