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Old November 23rd, 2018, 08:46 AM #11
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There was a time when the 22 upper concept made a lot of sense. Today I think there is a simpler alternative. I bought a M&P 15-22.
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Old November 23rd, 2018, 09:20 AM #12
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Quote:
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There was a time when the 22 upper concept made a lot of sense. Today I think there is a simpler alternative. I bought a M&P 15-22.
Yeah but your M&P wont exchange parts with my ARs as far as I know. It's all in what you value. I like commonality
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Old November 23rd, 2018, 11:37 AM #13
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CMMG does a good job on their kits but be careful using them in a gun that you will switch back to 5.56.

Lead buildup in the bore can cause high operating pressure. The lead .22 projectiles can also block the gas port and gas system.
I learned a lot about lead build up shooting Thunderbolt rounds in a new 22/45. Didn't think I'd ever get that barrel cleaned out. I'll watch for that. Are the inserts OK for suppressors?

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There was a time when the 22 upper concept made a lot of sense. Today I think there is a simpler alternative. I bought a M&P 15-22.
I looked at that. Pricing is a bit under a dedicated upper, but way more than an insert. Haven't found anything on sale.
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Old November 23rd, 2018, 04:11 PM #14
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The 15-22 is a better choice than a conversion. The 15-22 is always better than a complete .22 upper.

The only way where a conversion kit is not a better choice is when you have a limited budget (conversion it is half the price of a 15-22) or you have a SBR/R.R. Lower.

I would not shoot .22 with a conversiom kit unless you know 100% that the barrel stabilizes the projectiles.
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Old November 23rd, 2018, 04:25 PM #15
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You can use AR FCG's (LaRue MBT's work well in 15-22's), AR Grips, AR Collapsible Buttstocks, AR Muzzle Devices, and AR Sights/Optics in 15-22's

I can't recall if the AR Magazine Release is 15-22 compatible.
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Old November 23rd, 2018, 05:22 PM #16
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I love both of my complete, .22-dedicated CMMG uppers.

The drop-in conversion kits are pretty good, but if you can afford it go dedicated upper... the bump in accuracy and any possibility of lead buildup around the gas port offset the cost. Plus the sites are already zero'd in for the caliber.
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Old November 23rd, 2018, 05:41 PM #17
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Quote:
Originally Posted by silver78 View Post
There was a time when the 22 upper concept made a lot of sense. Today I think there is a simpler alternative. I bought a M&P 15-22.
If you have a NFA lower the cmmg 22 upper is a better choice. I assembled my own from a CMMG bolt + barrel kit. Runs great w Black Dog mags and drums. (are there any drums avail for the M&P?) Since the cmmg doesn't require a buffer tube, a pistol build is a hoot too.

Loading AR22 mags is easy and blazing fast w/ a McFadden lightnin' grip loader. Adapters avail for the M&P too.
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Old November 23rd, 2018, 07:54 PM #18
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Originally Posted by clandestine View Post
You can use AR FCG's (LaRue MBT's work well in 15-22's), AR Grips, AR Collapsible Buttstocks, AR Muzzle Devices, and AR Sights/Optics in 15-22's

I can't recall if the AR Magazine Release is 15-22 compatible.
Yes the mag release on the 15-22 is compatible. I installed a seekins mag release and a norgon ambi mag catch.
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Old November 23rd, 2018, 08:02 PM #19
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I have both a 15-22 and a dedicated CMMG 22 upper. I much prefer the dedicated upper for 2 reasons. The CMMG dedicated upper is much more accurate and a lot more reliable . I ended up sending the 15-22 back to Smith & Wesson 2 times because it was a continually jamming no matter what ammo I used.
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Old November 23rd, 2018, 08:37 PM #20
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Originally Posted by Cicirich View Post
I have both a 15-22 and a dedicated CMMG 22 upper. I much prefer the dedicated upper for 2 reasons. The CMMG dedicated upper is much more accurate and a lot more reliable . I ended up sending the 15-22 back to Smith & Wesson 2 times because it was a continually jamming no matter what ammo I used.
You do have a good point. Rifles like the 15-22, and even the 10/22 can be problematic. They can be improved but the factory rarely gets it right. Most of the reliability issues with the two platforms are issues with the feed ramps finish, a rough/sharp throat mouth, rough chamber, and the extractor geometry.

Conversion kits and dedicated uppers can suffer from the same issues.
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