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 Post subject: CMMG AR15 .22LR conversion kit questions
New postPosted: April 14th, 2018, 8:07 am 
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AZS; Woohoo!
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Just got one and the instructions say to not leave the BCG in the rifle when not shooting it. Can't see how that matters.
Any enlightenment out there?

Also, accuracy with Remington Thunderbolts was less than good. Any suggestions there?


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 Post subject: Re: CMMG AR15 .22LR conversion kit questions
New postPosted: April 14th, 2018, 10:29 am 
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Joined: August 5th, 2010, 9:37 pm
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RandyTF wrote:
Just got one and the instructions say to not leave the BCG in the rifle when not shooting it. Can't see how that matters.
Any enlightenment out there?

My take would be, so that the insert doesn't get welded to the chamber wall from carbon, corrosion or lead build up?

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 Post subject: Re: CMMG AR15 .22LR conversion kit questions
New postPosted: April 14th, 2018, 10:51 am 
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Not sure on your first question, but as far as accuracy goes, your barrel twist is twice as fast as what’s generally used in 22lr. Combine that with bore specs that are a thousand over (maybe more depending on your barrel) and you’re not left with a recipe for accuracy. I would try a few different brands of ammo that offer heavy pill, maybe this:

https://www.midwayusa.com/product/25061 ... round-nose


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 Post subject: Re: CMMG AR15 .22LR conversion kit questions
New postPosted: April 14th, 2018, 11:14 am 
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muta4warrior wrote:
RandyTF wrote:
Just got one and the instructions say to not leave the BCG in the rifle when not shooting it. Can't see how that matters.
Any enlightenment out there?

My take would be, so that the insert doesn't get welded to the chamber wall from carbon, corrosion or lead build up?




So you think the company assumes everybody that buys one of these kits doesn't clean up after a shoot?
If that were the case, we'd be hearing a lot of complaints about BCGs in just about every caliber freezing up.
Just can't see that as a reason.


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 Post subject: Re: CMMG AR15 .22LR conversion kit questions
New postPosted: April 14th, 2018, 11:17 am 
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AZS; Woohoo!
AZS; Woohoo!

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Str8Shot wrote:
Not sure on your first question, but as far as accuracy goes, your barrel twist is twice as fast as what’s generally used in 22lr. Combine that with bore specs that are a thousand over (maybe more depending on your barrel) and you’re not left with a recipe for accuracy. I would try a few different brands of ammo that offer heavy pill, maybe this:

https://www.midwayusa.com/product/25061 ... round-nose





From reading posts regarding Winchester M22 on a thread on AZS, I conclude that velocity is key since the M22 is designed for ARs in .22LR and has high velocity.
I have some M22 and will see if that makes a difference even though the Remington Thunderbolt is also high velocity. I was only shooting at 50 yards and that is
why I was a bit disappointed.


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 Post subject: Re: CMMG AR15 .22LR conversion kit questions
New postPosted: April 14th, 2018, 11:27 am 
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My guess would be the faster you try to shove that light pill down the barrel the worse your accuracy is going to be. You’re overspun as it is - velocity isn’t going to help that.


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 Post subject: Re: CMMG AR15 .22LR conversion kit questions
New postPosted: April 15th, 2018, 10:37 am 
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Joined: June 10th, 2014, 10:00 am
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Location: Avondale
The problem is that your barrel is not the correct 1:16 twist for .22lr

Plus you are using some of the shittiest ammo out there.

Stop being cheap/broke and just build a dedicated .22 upper like the rest of the civilized world.


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 Post subject: Re: CMMG AR15 .22LR conversion kit questions
New postPosted: April 15th, 2018, 11:51 am 
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FlareGun wrote:
The problem is that your barrel is not the correct 1:16 twist for .22lr

Plus you are using some of the shittiest ammo out there.

Stop being cheap/broke and just build a dedicated .22 upper like the rest of the civilized world.




I'm going to try several other types of ammo. Should have done that the first time out.
I wasn't trying to be cheap (even though it comes naturally) by using Remington Thunderbolts.
It was some that I could find during the .22LR shortage and now I'm shooting it up. As for
dedicated .22 AR, I was going to go that route but the CMMG kit is on sale at MidwayUSA and
my cheap button kicked on. :p


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 Post subject: Re: CMMG AR15 .22LR conversion kit questions
New postPosted: April 15th, 2018, 1:30 pm 
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I think those kits are fine for letting youngsters get the thrill out of shooting coffee cans with “dad’s gun” but you’re just looking for a headache if you expect any sort of real accuracy.


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 Post subject: Re: CMMG AR15 .22LR conversion kit questions
New postPosted: April 16th, 2018, 5:59 am 
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Why not do an experiment... _you_ leave _yours_ installed in the gun after shooting (and normal cleaning afterward, however you do it) and in about a year let us know how that goes... :)
enquiring minds want to know.


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 Post subject: Re: CMMG AR15 .22LR conversion kit questions
New postPosted: April 16th, 2018, 6:04 am 
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AZS; Woohoo!
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Joined: June 4th, 2011, 7:48 am
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Location: NW Valley
Str8Shot wrote:
I think those kits are fine for letting youngsters get the thrill out of shooting coffee cans with “dad’s gun” but you’re just looking for a headache if you expect any sort of real accuracy.




It was fair to midlin at 25 yards. Too bad my kids are long out of the nest. Guess I'll play with this for a while without
expecting to find the bullseye very often. I'm always trying to justify building another AR so here is my excuse.


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 Post subject: Re: CMMG AR15 .22LR conversion kit questions
New postPosted: April 16th, 2018, 6:43 am 
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AZS; Woohoo!
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Joe_King wrote:
Why not do an experiment... _you_ leave _yours_ installed in the gun after shooting (and normal cleaning afterward, however you do it) and in about a year let us know how that goes... :)
enquiring minds want to know.




Should I also store the rifle in the back yard?


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 Post subject: Re: CMMG AR15 .22LR conversion kit questions
New postPosted: April 16th, 2018, 6:57 am 
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Joined: February 3rd, 2010, 8:13 pm
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Location: Ahwatukee, AZ
I would follow the directions.

I don’t know why it says to not leave it in there.

I have left the 22lr bolt inside for months without issue.

I have the stainless one so I always clean it.

AR-15 typically only gets 1-2MOA and this holds true when you goto 22lr.

For making tight groups I like Federal Auto Match on Norma.


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 Post subject: Re: CMMG AR15 .22LR conversion kit questions
New postPosted: April 23rd, 2018, 6:25 am 
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AZS; Woohoo!
AZS; Woohoo!

Joined: June 4th, 2011, 7:48 am
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Location: NW Valley
Str8Shot wrote:
My guess would be the faster you try to shove that light pill down the barrel the worse your accuracy is going to be. You’re overspun as it is - velocity isn’t going to help that.




The directions say to shoot standard or high velocity ammo. No mention of bullet weight.


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 Post subject: Re: CMMG AR15 .22LR conversion kit questions
New postPosted: April 23rd, 2018, 3:28 pm 
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Joined: February 3rd, 2010, 8:13 pm
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Location: Ahwatukee, AZ
That heavy stuff is for bolt actions and suppressors.

That’s why it says for bolt actions.

A lot of that 60 grain stuff won’t even cycle a semi auto, much less an AR-15 conversion.

That’s why it says use standard or high velocity.

I shoot 40 grain Federal Auto Match.

Or CCI 40 grain.


Last edited by thejediknight on April 23rd, 2018, 4:22 pm, edited 1 time in total.

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