Does the Smith & Wesson M&P15 Lower work with the CMMG 5.56?
Lower Receiver
Smith & Wesson M&P15 Lower 5.56x45mm/.223 Remington
from $269.99
Bolt Carrier Group
CMMG 5.56
from $117.99
Smith & Wesson lower and CMMG bolt carrier group compatibility
Yes, they fit
The Smith & Wesson M&P15 Lower 5.56x45mm/.223 works with the CMMG 5.56. Our compatibility rules found no conflict between them.
This exact setup has been built more than once on GunPartPicker.
Counted from real GunPartPicker builds: parts lists people put together while planning to buy.
Checked by the same rules the AR builder runs on every part you add: caliber, frame size, receiver pattern, thread pitch and gas length.
Fit is judged from the specs retailers list, which can be missing or wrong. Confirm with the manufacturer before you buy, and have a qualified gunsmith check any build before you fire it.
How often builders pair the Smith & Wesson lower and CMMG bolt carrier group
Backed by thousands of qualified builds that have both a lower and a bolt carrier group.
Share of builds with the Smith & Wesson M&P15 Lower and any bolt carrier group
- Wilson Combat .308 Win Bolt CarrierDoes not fit6%
- This pairCMMG 5.560.5%
Share of builds with the CMMG 5.56 and any lower
- This pairSmith & Wesson M&P15 Lower 5.56x45mm/.22310%
Smith & Wesson M&P15 Lower
- Of lower picks
- 4.9%
- Median paid
- $270
CMMG 5.56
- Of bolt carrier group picks
- 0.2%
- Median paid
- $128
How we count ⌄
These shares come from GunPartPicker's build data: real parts lists people put together while planning a purchase, not sales or surveys. A build counts a part only when it is the final pick for its slot, so parts that were swapped out never count. Fit never comes from these numbers; it comes from our compatibility rules alone.
Frequently built with the Smith & Wesson lower and CMMG bolt carrier group
The part builders pick most often in each slot alongside these two, checked against both. Parts that conflict are left out.
Upper Receiver
Stock & Brace
Suppressor
Charging Handle
Smith & Wesson M&P15 Lower vs CMMG 5.56: specs and prices
| Smith & Wesson M&P15 Lower | CMMG 5.56 | |
|---|---|---|
| Best price | $339.20 at Classic Firearms | $117.99 at Ammunition Depot |
| Stores | 4 of 6 in stock | 5 of 7 in stock |
| Assembly | Complete | n/a |
| Platform | AR-15 | n/a |
| Caliber | 5.56 NATO | n/a |
| Color | Black | n/a |
| Cartridge | n/a | 5.56 NATO |
| Finish | n/a | Nitride |
Both for $457.19 at today's best prices.
Today's best prices and 90 day price history
Every store we track for each part, cheapest in stock first. Prices are checked through the day.
Smith & Wesson M&P15 Lower 5.56x45mm/.223
Price history, last 90 days
- Smith & Wesson M&P15 Lower: lowest $269.99 on Jul 11, highest $420.99 on Sep 26 over the last 90 days.
- CMMG 5.56: lowest $128.36 on Oct 3, highest $174.95 on Jul 6 over the last 90 days.
Bolt Carrier Groups frequently paired with the Smith & Wesson M&P15 Lower
Most picked next to it in real builds. Only parts our rules say fit the Smith & Wesson M&P15 Lower are listed.
Lower Receivers frequently paired with the CMMG 5.56
Most picked next to it in real builds. Only parts our rules say fit the CMMG 5.56 are listed.
