Does the CMMG MK/4 Armor work with the PSA 5.56 Full-Auto Nitride MPI?
Upper Receiver
CMMG MK/4 Armor
from $130.55
Bolt Carrier Group
PSA 5.56 Full-Auto Nitride MPI
from $89.99
CMMG upper and Palmetto State Armory bolt carrier group compatibility
Yes, they fit
The CMMG MK/4 Armor works with the PSA 5.56 Full-Auto Nitride MPI. 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 Palmetto State Armory 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 MK/4 Armor and any bolt carrier group
- Battle Arms14%
- This pairPSA 5.56 Full-Auto Nitride MPI7%
Share of builds with the PSA 5.56 Full-Auto Nitride MPI and any upper
- This pairCMMG MK/4 Armor0.3%
CMMG MK/4 Armor
- Of upper picks
- 0.1%
- Median paid
- $130
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 upper 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
Fits both
Lower Receiver
Fits both
Stock & Brace
Gas Block
Trigger
Pistol Grip
Barrel
CMMG MK/4 Armor vs PSA 5.56 Full-Auto Nitride MPI: specs and prices
| CMMG MK/4 Armor | PSA 5.56 Full-Auto Nitride | |
|---|---|---|
| Best price | $134.99 at Palmetto State Armory | $89.99 at Palmetto State Armory |
| Stores | 2 of 3 in stock | 1 of 1 in stock |
| Assembly | Stripped | n/a |
| Platform | AR-15 | n/a |
| Cartridge | n/a | 5.56 NATO |
| Style | n/a | Full-Auto |
| Finish | n/a | Nitride |
Both for $224.98 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 MK/4 Armor: lowest $130.55 on Jul 5, highest $144.79 on Jul 24 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 MK/4 Armor
Most picked next to it in real builds. Only parts our rules say fit the CMMG MK/4 Armor are listed.
Upper 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.
