HM2 AR upper build -- any interest in barrels? - Page 2 - RimfireCentral.com Forums

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  #16  
Old 07-05-2020, 08:51 PM
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So, if I'm following this right, I'd just need to build a standard upper with the 17hm2 barrel, then use a CMMG .22LR kit with mag, and find a way (bolt buddy, maybe) to add more weight to the bolt.

Is that the idea?
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  #17  
Old 07-06-2020, 08:32 AM
Mike_AK
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Do the S&W mags work with the 17HM2 round, or is someone with injection molding equipment going to need to come up with some new followers?
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  #18  
Old 07-06-2020, 08:37 AM
Mike_AK
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Originally Posted by m17hm2 View Post
So, if I'm following this right, I'd just need to build a standard upper with the 17hm2 barrel, then use a CMMG .22LR kit with mag, and find a way (bolt buddy, maybe) to add more weight to the bolt.

Is that the idea?
The 22LR and 17HM2 have the same case head dimensions so the bolt should function from that perspective. I think all AR rimfire conversions benefit from a heavier bolt. Regarding magazines, IMO you are much better off going with the Catch22 and using S&W M&P 15-22 mags. Some folks use the Better Mag Adapter, but it can be finicky...at least the one I tried initially was.
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  #19  
Old 07-06-2020, 08:40 AM
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Standard .22 mags work in other platforms (10/22, Kimber 1911, Marlin 717), so I'm hoping, but the proof is in the testing.... as always.
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  #20  
Old 07-06-2020, 05:42 PM
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I just tried one of my BDM 15 round magazines with 17m2 ammo. they fit fine. I worked the charging handle on my 22lr AR pistol with the magazine and all 15 rounds fed and ejected fine.
Attached Images
File Type: jpg 17m2A.jpg (64.8 KB, 23 views)
File Type: jpg 17m2B.jpg (89.3 KB, 24 views)
File Type: jpg 17m2C.jpg (57.2 KB, 25 views)
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  #21  
Old 07-06-2020, 05:44 PM
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Having an AR in 17m2 is intriguing. My main concerns are getting the bolt weight and spring weight correct to prevent any and all OOB. The 17m2 definitely has a different pressure curve than 22lr has.
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  #22  
Old 07-06-2020, 05:56 PM
colonelhogan44
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Quote:
Originally Posted by m17hm2 View Post
So, if I'm following this right, I'd just need to build a standard upper with the 17hm2 barrel, then use a CMMG .22LR kit with mag, and find a way (bolt buddy, maybe) to add more weight to the bolt.

Is that the idea?
The only answer is "maybe" at this point. The BoreBuddy weight system is rated for 22lr only, as are all the other components you're going to be choosing from. These are uncharted waters, proceed with extreme caution.

Collectively, all the early adopters in this thread may come up some pretty cool and functional rifles, or we may all throw up our hands and give up if OOB problems cannot be resolved.
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  #23  
Old 07-06-2020, 06:22 PM
9x19

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Originally Posted by colonelhogan44 View Post
The only answer is "maybe" at this point. The BoreBuddy weight system is rated for 22lr only, as are all the other components you're going to be choosing from. These are uncharted waters, proceed with extreme caution.

Collectively, all the early adopters in this thread may come up some pretty cool and functional rifles, or we may all throw up our hands and give up if OOB problems cannot be resolved.
^This!^

Those of us who went down a similar route with the 10/22 (before VQ made their heavy bolts available), using heavy bolt handles and playing with springs, probably had our share of OOB issues too.... so that is understood going in for me.

Volquartsen was one of the first to prove a safe/reliable 10/22-based .17 Mach II semi-auto was possible. Perhaps Bore-Buddy will be the first in the AR realm?
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  #24  
Old 07-06-2020, 07:52 PM
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Quote:
Originally Posted by colonelhogan44 View Post
The only answer is "maybe" at this point. The BoreBuddy weight system is rated for 22lr only, as are all the other components you're going to be choosing from. These are uncharted waters, proceed with extreme caution.

Collectively, all the early adopters in this thread may come up some pretty cool and functional rifles, or we may all throw up our hands and give up if OOB problems cannot be resolved.
Those are the kind of waters I like to swim in.
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