AR 15 to .22 conversion question

[gunwhatgun]

I have a conversion bolt for my M&P15. I played with it for the first time today. I did not switch optics from the ones I use for the .556 bolt, I figured at 50 yard it would be kind of close and I could just compensate. So here is the question. Are all .22 conversions amazingly inacurate, or do I just have a dud? I knew the optics would be off ,but damn. it was throwing lead all over the place. At one point I just shot looked for the hole and then aimed at the same spot I did on the first shot and the hit would be 180 degrees off. Is this normal??

[Lumber_Jack]

What kind of spread are we talking here? 5" or 24". Generally they are inherently inaccurate due to the distance from the bullet to the rifling. The bullet has to travel a short distance before contacting the rifling.

[gjohnsoniv]

Look up Dolomite's fix for this. Basically it is squeezing the bullet down some and the cure is to barely remove some metal from the conversion.

Edited September 13, 2012 by gjohnsoniv

[krunchnik]

I have the CMMG kit in stainless and have tried it in both my S&W MP15 Sport and my DPMS.It definately is more accurate in the DPMS.The bolt functioned 100% in both rifles,so thats good.The Smith was shooting about a 2 inch group at 40 yards,whereas the DPMS was around 1 inch

[TnShooter83]

The CMMG kit I shoot is about 2" or a little more at 25 yards with the CCI Mini-Mag ammo. I've never bothered to try any other brands.

I've only shot about 125 rounds through the rifle and so far it has worked 100%. It does get the lower VERY dirty and kind sucks to clean the trigger parts.

I shoot it from a Windham Arms Carbine 16" barrel 1/9 twist Chrome lined. Maybe it is your barrel or maybe it's the ammo?

I do hope you find the problem as it is alot cheaper to shoot .22 than 5.56

[Dolomite_supafly]

The problem is the kits swage the bulets down to a .221" diameter. Most rimfires start out with a larger bullet diameter than centerfire bullets so they should shoot well. I have taken centerfire barrels and made rimfire barrels out of them and they shot fine.

This explains it all:

http://www.tngunowners.com/forums/topic/49124-why-your-ar-conversion-wont-shoot-accurately/page__hl__conversion

Dolomite