Does the CMMG MK4 .223 Remington AR Lower work with the PSA 5.56 Full-Auto Nitride MPI?
Lower Receiver
CMMG MK4 .223 Remington AR Lower
from $100.02
Bolt Carrier Group
PSA 5.56 Full-Auto Nitride MPI
from $89.99
CMMG lower and Palmetto State Armory bolt carrier group compatibility
Yes, they fit
The CMMG MK4 .223 Remington AR Lower works with the PSA 5.56 Full-Auto Nitride MPI. 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 CMMG lower and Palmetto State Armory bolt carrier group
Backed by thousands of qualified builds that have both a lower and a bolt carrier group.
Share of builds with the CMMG MK4 .223 Remington AR Lower and any bolt carrier group
- This pairPSA 5.56 Full-Auto Nitride MPI6%
Share of builds with the PSA 5.56 Full-Auto Nitride MPI and any lower
- This pairCMMG MK4 .223 Remington AR Lower0.6%
CMMG MK4 .223 Remington AR Lower
- Of lower picks
- 0.3%
- Median paid
- $99
PSA 5.56 Full-Auto Nitride MPI
- Of bolt carrier group picks
- 3.8%
- Median paid
- $75
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 lower and Palmetto State Armory 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
Stock & Brace
Gas Block
Upper Receiver
Trigger
Pistol Grip
CMMG MK4 .223 Remington AR vs PSA 5.56 Full-Auto Nitride MPI: specs and prices
| CMMG MK4 .223 Remington AR | PSA 5.56 Full-Auto Nitride | |
|---|---|---|
| Best price | $100.02 at Classic Firearms | $89.99 at Palmetto State Armory |
| Stores | 3 of 7 in stock | 1 of 1 in stock |
| Assembly | Stripped | n/a |
| Platform | AR-15 | n/a |
| Caliber | 5.56 NATO | n/a |
| Finish | Cerakote | Nitride |
| Color | Black | n/a |
| Cartridge | n/a | 5.56 NATO |
| Style | n/a | Full-Auto |
Both for $190.01 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.
Price history, last 90 days
- CMMG MK4 .223 Remington AR Lower: lowest $94.69 on Jul 15, highest $126.99 on Jul 11 over the last 90 days.
- PSA 5.56 Full-Auto Nitride MPI: lowest $69.99 on Jul 31, highest $89.99 on Aug 11 over the last 90 days.
Bolt Carrier Groups frequently paired with the CMMG MK4 .223 Remington AR Lower
Most picked next to it in real builds. Only parts our rules say fit the CMMG MK4 .223 Remington AR Lower are listed.
Lower Receivers frequently paired with the PSA 5.56 Full-Auto Nitride MPI
Most picked next to it in real builds. Only parts our rules say fit the PSA 5.56 Full-Auto Nitride MPI are listed.
