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  #1  
Old 06-11-2008, 04:49 PM
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AR-15 rimfire conversions



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I'm looking to get a conversion for my NM rifle. Anyone here have experience with these conversion units? Pro's, Con's?

-NH
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Old 06-13-2008, 10:30 AM
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i wish i had real world experience with them to help you out, but can only tell you what i have read:

as of now, you really dont have much choice.

the ceiner kits are most common. You may be able to find one new, but might have to settle on a used one.

reliable high cap mags are manufactured by black dog machine (BDM)

There are a couple companies that are in the process of manufacturing their own conversion kit (spikes tactical for sure and possible larue). the eta of these as far as i know today have not been determined.

the only real con i see is that with the conversion kit, your shooting a .22 through a .223 barrel without the proper twist rate. this will reduce some accuracy.

if you are just plinking, then it really doesnt matter

dedicated uppers resolve this issue as they use a proper barrel. They also cost about $500+

a great resource is here:

http://www.ar15.com/forums/forum.html?b=3&f=15
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Old 06-13-2008, 03:46 PM
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It will also be overbored for the 22 cal bullet. A 10-22 wouldn't be much more and a lot more fun and accurate.
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Old 06-13-2008, 05:53 PM
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Watch your twist rate... A dedicated upper as opposed to a conversion unit is the best way to go... Otherwise cleaning the barrel will be a blast. Compass Lake is a good source for a dedicated upper.
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Old 06-13-2008, 10:10 PM
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I had a Air Force surplus kit

Worked well but accuracy poor shooting out of a Rock River Varmint. What I did to replace the unit. I Built a 10/22 with a 24" bull barrel and a synthetic thumb hole stock to simulate the AR. Definitely the way to go or get a dedicated .22 upper.
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Old 06-14-2008, 01:19 PM
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Quote:
Originally Posted by dharper1969 View Post
Watch your twist rate... A dedicated upper as opposed to a conversion unit is the best way to go... Otherwise cleaning the barrel will be a blast. Compass Lake is a good source for a dedicated upper.
I've put as many as 1000 rounds through my M261 before bore cleaning with NO bore cleaning whatsoever.

I have found, though, that it does make sense to make sure the chamber is clean every 300-500 rounds (depending on ammo). The AR will fire OOB and you don't want a 3/4 chambered round lighting off (don't ask me how I know this).
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Old 06-14-2008, 06:19 PM
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1 in 9 might not be so bad.... 1 in 7 is something else....
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Old 06-21-2008, 01:11 AM
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where can you get an M261?

any ideas? can you get a brand new unit? is the olympic arms model a faithful copy? from compass lake engineering's website, they prefer the M261, and from accuracy speak's website, they prefer the ciener. does anybody have any insight as to the differences in these units?
thanks for any help,
kstockfo
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Old 06-21-2008, 08:49 AM
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I've been using an military surplus version of the ceiner with good success. These folks seem to be selling them: http://www.22lrconversions.com/

I'm using 1:9 twist oly arms and find accuracy plenty good for plinking, about 2-2.5" groups with stock ammo, I fattened some up with the Paco tool and those seemed a bit better. Hope this helps!
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Old 06-25-2008, 07:15 PM
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Thanks for the replies folks. It seems that the reasons for my interest in this rimfire alternative was a bit misconstrued. I recently bumped into a former match competitor that had used his AR-15 "space-gun" at some point last year, next to me on the firing line. He did fairly well for that 200 yard distance....... I had assumed that he had installed a conversion kit for his usual center-fire space gun (match rifle). It turns out that he had a Ciener conversion that was part of a dedicated .22 upper. My mistake, but one definitely worth exploring.

-NH

BTW.... This rifle has an 8" twist. As interesting as conversion seems, it won't give me the accuracy I am looking for.
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  #11  
Old 06-25-2008, 09:00 PM
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Tac-Sol
Has some new conversion kits out!
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Old 06-26-2008, 07:09 AM
azmbl22
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nordic had some really neat uppers at the NRA convetion, incl some in .22wmr and .17hmr
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