CMMG 22lr shoots low [Archive] - Glock Talk

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GP55445
02-14-2010, 14:39
I have a 16" Doublestar with an Comp M2 that was zeroed @ 25 yds as recommended. I bought the CMMG 22lr conversion and I'm shooting 2"-2.25" low @ 25 yds. I've tried 3 different types of ammo and same results. I live in MN so I haven't had a chance to take it outside to try at longer distances.

Couldn't find anything in the forum so my apologies if this was answered in the past.

Thx.

GP

HAIL CAESAR
02-14-2010, 15:24
That is normal. If you are sighted in with .223/5.56 a .22lr will shoot a bit low. The conversion is for cheapo practice not precision shooting.

ottomatic
02-14-2010, 16:10
You can nearly get "precision", but your problem has nothing to do with the quality of your 22 ammo.
You cannot expect two different calibers to have the same trajectory.

HAIL CAESAR
02-14-2010, 17:49
Maybe precision was the wrong term. Although with a .22 LR kit in a standard AR barrel will only net 2 to 3 inch groups at 25 yards.

But the POI (point of impact) of the .22 LR being different that with a .223/5.56 round if almost going to be a given. The .22 LR will strick the target considerably lower than a .223 round when switching between the stock gun and the conversion kit.
There is two things to do.
1. Figure out the differance and adjust the sights back and forth between the ammo. I would not recommend this as once you have it set for the .223/5.56 ammo I would just leave in be.
2. Shoot the .22 conversion with the sights zero'ed to the .223 ammo. Since you know that the .22 LR ammo strikes 2 inches low take that into account when you look at your target. So if you are practicing SD drills then shoot for the center of mass as you would if you are shooting the .223 ammo. If your bullet holes are grouped well but just 2 inches or so under when you were aiming then you know you are good to go.