Does Anyone Here Use .22LR Conversion On M&P 15 Sport .223 ?

Bluegrass Picker · Feb 15, 2014

Hi,
I am interested in the idea of using a CMMG or other .22LR conversion kit on my .223 sport.

I have heard from various sources that the CMMG's won't work with the sport and that there are no other available options.

Is there anyone here who has experience with a .22LR conversion kit for the M&P Sport .223?

Thanks in advance.

Bluegrass Picker

cyphertext · Feb 15, 2014

Why would the CMMG kit not work with the Sport? I have a CMMG Quebec-A (complete rifle), but the lower is nothing more than a CMMG multi-cal lower. The Sport uses standard mil-spec dimensions on their upper and lower, and has a mil-spec trigger... I see no reason that it would not be compatible with the Sport.

Bluegrass Picker · Feb 15, 2014

cyphertext said:
Why would the CMMG kit not work with the Sport? I have a CMMG Quebec-A (complete rifle), but the lower is nothing more than a CMMG multi-cal lower. The Sport uses standard mil-spec dimensions on their upper and lower, and has a mil-spec trigger... I see no reason that it would not be compatible with the Sport.

I called CMMG and they informed me that their conversion kits would not work with the Sport. They could give me no reason why not, other than they didn't know what S&W does different with their specs.

I wasn't very comfortable with their answer as the person I talked to didn't sound very confident, so I thought it would be a good plan to see if anyone here actually used a .22LR conversion kit in their Sport.

cyphertext · Feb 15, 2014

Hmmm...

S&W M&P15 with CMMG .22 LR AR15 Conversion Kit - Is It JUNK? - YouTube

S&W M&P 15T .223 AR-15 with a 22LR CMMG Conversion Kit - YouTube

Shooting the CMMG .22LR conversion kit in my AR (S&W M&P-15) - YouTube

These are not Sports, but the Sport uses the same bolt, BCG, and FCG as the rest of the M&P 15 line. You can swap Sport upper and lowers with the rest of the line as well. It appears that CMMG doesn't know their own product.

Bluegrass Picker · Feb 15, 2014

cyphertext said:
Hmmm...

S&W M&P15 with CMMG .22 LR AR15 Conversion Kit - Is It JUNK? - YouTube

S&W M&P 15T .223 AR-15 with a 22LR CMMG Conversion Kit - YouTube

Shooting the CMMG .22LR conversion kit in my AR (S&W M&P-15) - YouTube

These are not Sports, but the Sport uses the same bolt, BCG, and FCG as the rest of the M&P 15 line. You can swap Sport upper and lowers with the rest of the line as well. It appears that CMMG doesn't know their own product.

Very helpful links. Thanks!

CanonEOS · Feb 15, 2014

Am the only one who would rather just buy an MP 15-22?

Vinney47 · Feb 16, 2014

CanonEOS said:
Am the only one who would rather just buy an MP 15-22?

Nope

With the 15-22 you get a better twist rate down the bore for the 22lr rounds, among many other good things. About the only bad is that if you are wanting it for training it is lighter, so feels different that way. But there are ways to remedy that.

I do agree though that the Sport is mil spec in all the ways it needs to be to have the .22 conversion kit work with it.

JaPes · Feb 16, 2014

CanonEOS said:
Am the only one who would rather just buy an MP 15-22?

I had a M&P 15-22. I sold it during the panic for more $$$ than I bought it new. An acquaintance wanted it, and knowingly overpaid me for it.

I like the M&P 15-22. It mimics the controls and exterior features of it's center-fire cousin. What it didn't mimic was the weight of an AR-15.

I'll probably end up with a .22lr AR again, but this time I'm going to opt for a complete .22lr AR upper to mount to my AR-15 lower. I've got to the point where my lower has a 2-stage trigger, KNS anti-rotation pins, grip, etc that I want to practice with. I also want to simulate the weight of an AR-15.

spad124 · Feb 16, 2014

Before the panic last year I had a AR 15 and a Ciener 22LR conversion for it. Like JaPes I sold both to someone who had to have them. The Ciener ran flawlessly. No FTEs. All rounds loaded and fired. Accuracy was about what I could get with .223. The only difference was the POI. There was about 3 inches difference in elevation between .223/5.56 and 22lr. Makes sense when you consider velocity and bullet weight.

Now I have a Sport- which is a much better firearm than my previous AR. From a functional standpoint I would have no reservations about getting a conversion kit for it. The problem is I can't find 22LR! I can find all the .223 I want, but not 22LR.

A dedicated upper would solve the difference in POI. The Sport now comes with an A1 style sighting set up and it is cumbersome to change elevation. If you get a conversion and keep the open sights I'd suggest you replace the rear MBUS with a fully adjustable like the LMT the Sport originally came with. You can then easily change elevation between 22LR and .223

cyphertext · Feb 16, 2014

spad124 said:
The problem is I can't find 22LR! I can find all the .223 I want, but not 22LR.

Jump over to the 15-22 forum and watch the ammo thread. I was able to order 1300 rounds in a week because of that thread. Still waiting for the last 500 to get here, as the delivery date was affected by the weather.

spad124 · Feb 16, 2014

cyphertext said:
Jump over to the 15-22 forum and watch the ammo thread. I was able to order 1300 rounds in a week because of that thread. Still waiting for the last 500 to get here, as the delivery date was affected by the weather.

I'll do that. Thanks.

JaPes · Feb 16, 2014

Folks were mocking me a few years ago for stocking up on .22lr when it was plentiful and readily available. Who would have ever thought a 550 brick of Fed Bulk would be harder to find than 9mm. When I find .22lr on the shelf or in-stock, I leave it for the guy who needs it.

cyphertext · Feb 16, 2014

JaPes said:
Folks were mocking me a few years ago for stocking up on .22lr when it was plentiful and readily available. Who would have ever thought a 550 brick of Fed Bulk would be harder to find than 9mm. When I find .22lr on the shelf or in-stock, I leave it for the guy who needs it.

You forgot cheap... when you were buying it was cheap and plentiful.

Just last week, Cabela's price went from $24.99 to $27.99 for a 500 ct. brick of CCI Blazer .22lr. When I told my buddy that I was able to get 1300 rounds of .22, he asked if that cost me $200. I said no, normal pricing. He asked where I found it for $13 a brick? Had to tell him not old normal pricing, but new normal pricing... between $20 and $25 per brick depending on brand.

JaPes · Feb 16, 2014

$25 - $30 per brick when it can be found... Any brick. Welcome to the new normal. I was stocking up an extra brick when I could at $17 per brick. I wasn't clearing out shelves of it. It just built up.

But I digress...

Back on topic... What dedicated .22lr uppers do any of the members here have good experiences with? I see CMMG. Are there any others?

ChattanoogaPhil · Feb 16, 2014

CanonEOS said:
Am the only one who would rather just buy an MP 15-22?

No, and I got a 15-22.

But some guys have a ton of money in their AR lowers so a .22 upper might make a lot more sense.

Hobie1 · Feb 16, 2014

I too bought lots of .22lr back before the end of days. I own both the 15-22 and the Sport. It's true about the feel of the 15-22 vs. the Sport however I enjoy them both.
Hobie

spad124 · Feb 16, 2014

JaPes said:
$25 - $30 per brick when it can be found... Any brick. Welcome to the new normal. I was stocking up an extra brick when I could at $17 per brick. I wasn't clearing out shelves of it.

Same here. I used to buy one brick when it went on sale or if I was planning on a shooting session. So, I have some. Just hate to shoot out what I have and not be able to replace it.

JaPes · Feb 16, 2014

spad124 said:
Same here. I used to buy one brick when it went on sale or if I was planning on a shooting session. So, I have some. Just hate to shoot out what I have and not be able to replace it.

That's unavoidable. We can insulate ourselves from ammo price and availability fluctuations so much. What feels expensive today may feel really affordable two years down the road.

vipermd · Feb 16, 2014

spad124 said:
A dedicated upper would solve the difference in POI. The Sport now comes with an A1 style sighting set up and it is cumbersome to change elevation. If you get a conversion and keep the open sights I'd suggest you replace the rear MBUS with a fully adjustable like the LMT the Sport originally came with. You can then easily change elevation between 22LR and .223

So with a dedicated upper there would not be a change in POI. Right? Be Safe,

Hobie1 · Feb 16, 2014

vipermd said:
So with a dedicated upper there would not be a change in POI. Right? Be Safe,

No, the point of impact will change. The point of aim will have to be adjusted to simulate .223 out to 100 yds.

Does Anyone Here Use .22LR Conversion On M&P 15 Sport .223 ?

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