Does the CMMG MK4/ Forward Assist Coyote Tan work with the LMT Piston Full Auto 5.56?

Upper Receiver
CMMG MK4/ Forward Assist Coyote Tan
from $127.99

Bolt Carrier Group
LMT Piston Full Auto 5.56
CMMG upper and Lewis Machine & Tool bolt carrier group compatibility
Yes, they fit
The CMMG MK4/ Forward Assist Coyote Tan works with the LMT Piston Full Auto 5.56. Our compatibility rules found no conflict between them.
This exact setup is in a real GunPartPicker build.
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 CMMG upper and Lewis Machine & Tool bolt carrier group
Backed by thousands of qualified builds that have both an upper and a bolt carrier group.
Share of builds with the CMMG MK4/ Forward Assist Coyote Tan and any bolt carrier group
- This pairLMT Piston Full Auto 5.5617%
- CMMG 5.5617%
Share of builds with the LMT Piston Full Auto 5.56 and any upper
- This pairCMMG MK4/ Forward Assist Coyote Tan3%
CMMG MK4/ Forward Assist Coyote Tan
- Of upper picks
- 0.1%
- Median paid
- $128
LMT Piston Full Auto 5.56
- Of bolt carrier group picks
- 0.4%
- Median paid
- n/a
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 CMMG upper and Lewis Machine & Tool bolt carrier group
The part builders pick most often in each slot alongside these two, checked against both. Parts that conflict are left out.
Charging Handle

Radian Raptor & Talon Safety Selector Combo
Unconfirmed
Lower Receiver
Barrel
Gas Block
Handguard

Daniel Defense MFR XL Free Float
Fits both
Muzzle Device
Stock & Brace
CMMG MK4/ Forward Assist vs LMT Piston Full Auto 5.56: specs and prices
| CMMG MK4/ Forward Assist | LMT Piston Full Auto 5.56 | |
|---|---|---|
| Best price | $127.99 at Optics Planet | n/a |
| Stores | 0 of 1 in stock | n/a |
| Assembly | Stripped | n/a |
| Platform | AR-15 | n/a |
| Cartridge | n/a | 5.56 NATO |
| Style | n/a | M16 Bolt Carrier |
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.
CMMG MK4/ Forward Assist Coyote Tan
- Optics Planetout of stock$127.99
LMT Piston Full Auto 5.56
No store lists it today.
Price history, last 90 days
- CMMG MK4/ Forward Assist Coyote Tan: lowest $123.99 on Aug 29, highest $129.99 on Jul 5 over the last 90 days.
Bolt Carrier Groups frequently paired with the CMMG MK4/ Forward Assist Coyote Tan
Most picked next to it in real builds. Only parts our rules say fit the CMMG MK4/ Forward Assist Coyote Tan are listed.
Upper Receivers frequently paired with the LMT Piston Full Auto 5.56
Most picked next to it in real builds. Only parts our rules say fit the LMT Piston Full Auto 5.56 are listed.
















