CMMG conversion vs M&P 15-22

THier · Jan 29, 2021

Any experience?

erwos · Jan 29, 2021

M&P is easier to get a reliable LRBHO, and it's a pretty reliable gun in general. There are some anecdotal stories about sears giving out and giving you some unexpected happy-fun-full-auto, but it's unclear how widespread it is.

CMMG is, IMHO, a superior solution if you'd like to try to keep using a tricked-out AR lower and don't care as much about LRBHO (which is functionally useless for something like Steel Challenge anyways). Or if you don't want to deal with buying a genuine new gun. Just don't buy BDM clear mags, those things ALL cracked on me after five years and became useless.

Melnic · Jan 29, 2021

barrel twist and bore diameter is different for a dedicated 22LR upper vs a cmmg conversion using your AR upper.
M&P I think is 1:16 just like most 22 rifles

I put a dedicated 22LR upper I built on my CMMG conversion as a "project" and its about as accurate as a production 10/22. Since I had spare parts to use, I did not spend much but if I had to pay for all the parts, was full in more than an M&P for sure

I will say it this way, if you want to shoot your AR offhand at 25 yards for an indoor range that does not allow 223/556 or you just want to save ammo, CMMG is a good solution. If you want to shoot more accurately at 50 yards, not so good of a solution.

with the gas port, its said you want to so often shoot centerfire through the upper you put the cmmg if its not a dedicated 22LR (no gas port) barrel.

bronco · Jan 29, 2021

I don't have a dedicated 22 upper, but in the past have used a CMMG conversion. I found that it shoots better with heavier grain and at least standard or high velocity ammo. A lighter bullet and a greater distance creates a larger spread and a lot of key holing. For me, 25 yards was the limit for consistent results.
If you want to get consistent, accurate performance and to go farther out, you pretty much need a dedicated upper so the bullet doesn't have to jump to the rifling in the barrel and for a 1:16 twist rate.

bronco · Jan 29, 2021

The CMMG conversion is a quick easy way to have a lot of fun, and inexpensive to shoot as well..

John from MD · Jan 29, 2021

I have had both. The CMMG conversion will shoot better if you have a good quality 1 in 9 twist barrel. My Bushmaster is able to give me 2 inch groups at 50 yards using bulk ammo and a 4x scope. The dedicated MP15 will give me 1 inch groups with the same set up. At one time it mattered to me but, as I get older, I can't shoot as good as when I was younger so It doesn't bother me at all. :lol:

Brownl345 · Jan 29, 2021

You might also consider looking at the Tippmann M4-22. They are rock solid.

Sirex · Jan 29, 2021

I have a couple 15-22s, and they are a ton of fun. One for my son, one for my daughter. They have been reliable, reasonably accurate, and super easy to take down and clean. The 15-22 may be my favorite rifle, they are just plain fun. I have a few of the CMMG mags (not the insert conversion), and they 15-22 mags are a breeze to load compared to the CMMG mags.

alucard0822 · Jan 29, 2021

If you just want an AR-ish 22, the M&P15-22 is pretty easy to live with, but you are limited if you want to upgrade or build one. Conversion kits can be reliable and somewhat accurate, but they get filthy fast, and you get trash in your barrel and gas system. CMMG pattern dedicated builds are the best IMO. Use a polymer or cheap lower, and you can build one close to the cost of the M&P, or make it as wild as you want, including side folders as you no longer need a buffer tube. You can use 15-22 mags with a bettermag adapter. My 2 were built from mostly spare parts from older builds I upgraded from, or cheap parts I wouldn't use on a centerfire build. They do suppress really well, and the action is quieter than the 10/22s, all 4 of these are hosts

fogman · Jan 30, 2021

+1on the bettermag adapter. Allows the use of 15-22 mags in an AR lower with a 22lr upper. And gives you a reliable LRBHO. I've had less feed issues with the 15-22 mags than the black dog mags.

spoon059 · Jan 30, 2021

I built a 4.5" barrel 22LR with a CMMG built and love it. My lower is still mil-spec so I can put another upper on it and be fully functional. With an actual 22LR barrel you get better accuracy and correct twist rate.

Sent from my SM-N970U using Tapatalk

THier · Jan 31, 2021

Went to Gettysburg show, not a 15-22 to be found. What I DID find from our friends at SCSG was the CMMG kit. It DEMANDED to come home with me, so it and 2 mags have a new home.

babalou · Jan 31, 2021

Aww

THier said:
Went to Gettysburg show, not a 15-22 to be found. What I DID find from our friends at SCSG was the CMMG kit. It DEMANDED to come home with me, so it and 2 mags have a new home.

I love happy endings. Glad your adoption was quick and easy.

sickpuppyz · Feb 19, 2021

I am taking a bit of a diff approach. I thought of the m&p but chose a diff path. I have cmmg banshee 200 mk4. so I purchase the cmmg BCG. I bought few parts from borebuddy to enhance the BCG. Next:
buy upper, barrel and handguard to have a dedicated full upper with correct barrel twist. last step, I will buy complete or build a cheaper lower and mount the upper to it. so at some point I will have a separate dedicated 22lr rifle. Consider this my first foray into building my own AR. also, I am not sure of the lower yet. I may decide not to buy, or buy much later. I have other priorities right now, including getting my first 1911 probably in 10 mm, my first revolver, my first Galil/ak variant in 308, maybe the FK brno PSD, also have a few other items on the list. so I need plenty of money to buy the guns and also the ammo to shoot. yeah...too many wants and not sure which I want to go with first, but in the meantime I am waiting to receive my 22lr bcg...my first 22 anything.

btw - this path involves making changes to the conversion BCG. CMMG has both 22lr, a conversion BCG and a dedicated BCG. The difference is that the conversion has what looks liek the 5.56 casing to fit to the 5.56 barell. So that would need to be changed with a collar to mate with 22 upper/ barrel

dedicated BCG: https://www.righttobear.com/CMMG-dedicated-22LR-stainless-steel-bolt-group-p/22ba487.htm

conversion BCG: https://cmmginc.com/product/22lr-ar-conversion-kit-bravo-w-3-10rd-magazines-grey/

Russ D · Feb 25, 2021

Does anyone know the best way to add a folding stock to a dedicated AR-22 build? Since the buffer tube isn’t needed is a Sig compatible folder the best way to attach to a standard AR lower?

alucard0822 · Feb 25, 2021

Russ D said:
Does anyone know the best way to add a folding stock to a dedicated AR-22 build? Since the buffer tube isn’t needed is a Sig compatible folder the best way to attach to a standard AR lower?

The cleanest and coolest looking IMO is this:
https://www.knsprecisioninc.com/product/ar-mcx-stock-adapter-with-flange/

With one of these:
https://www.sb-tactical.com/product/fs1913/

A little over $200 is steep for a 22 stock/brace, but basically an MCX setup with any AR15 lower that will be dedicated 22 (or Sig Virtus upper) only.

Could do other AR15 folding adapters like the Law or Sylvan, but many cheap ones are intended for AKs (or other rifles) and the charging handle will hit it.

Muleskinner · Feb 25, 2021

I have two cmmg conversion kits and then I have a dedicated cmmg ar22 with an actual 22 long rifle barrel instead of the AR-15 barrel. While they're both about the same in reliability. They both feed very well and rarely have a failure to feed or a failure to eject the dedicated 22 long rifle barrel is considerably more accurate especially at 50 yards or more. You can really tell the difference. I've run dozens of different types of ammo through both and it doesn't really seem to make much difference. The slower spin makes that barrel more accurate.

Muleskinner · Feb 25, 2021

Russ D said:
Does anyone know the best way to add a folding stock to a dedicated AR-22 build? Since the buffer tube isn’t needed is a Sig compatible folder the best way to attach to a standard AR lower?

I have one with a folding buffer tube. Honestly I bought one of the cheap knockoff folders from wish.com. I figured there's no real felt recoil from a 22 and it should hold up and so far it has I think I paid $30 for it where the actual law tactical folding unit is over 200. And that's if you can find it. I figured for $30 if it breaks after a while I can replace it with another one for $30. I can do that several times before I've hit 200

Russ D · Feb 26, 2021

Will the Brownells BRN lower work with a dedicated AR-22 upper? I just saw one and it has a pic rail built into the receiver.

Russ D · Feb 26, 2021

I just ordered the KNs unit. Looks quality. Thanks bud you never disappoint with advice.

alucard0822 said:
The cleanest and coolest looking IMO is this:
https://www.knsprecisioninc.com/product/ar-mcx-stock-adapter-with-flange/

With one of these:
https://www.sb-tactical.com/product/fs1913/

A little over $200 is steep for a 22 stock/brace, but basically an MCX setup with any AR15 lower that will be dedicated 22 (or Sig Virtus upper) only.

Could do other AR15 folding adapters like the Law or Sylvan, but many cheap ones are intended for AKs (or other rifles) and the charging handle will hit it.

CMMG conversion vs M&P 15-22

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