Does the CMMG MK/4 Armor work with the Aero Precision 5.56 BCG W/C158 Bolt?
Upper Receiver
CMMG MK/4 Armor
from $130.55
Bolt Carrier Group
Aero Precision 5.56 BCG W/C158 Bolt
from $148.99
CMMG upper and Aero Precision bolt carrier group compatibility
Yes, they fit
The CMMG MK/4 Armor works with the Aero Precision 5.56 BCG W/C158 Bolt. 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 upper and Aero Precision 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
- This pairAero Precision 5.56 BCG W/C158 Bolt14%
- Battle Arms14%
Share of builds with the Aero Precision 5.56 BCG W/C158 Bolt and any upper
- This pairCMMG MK/4 Armor0.2%
CMMG MK/4 Armor
- Of upper picks
- 0.1%
- Median paid
- $130
Aero Precision 5.56 BCG W/C158 Bolt
- Of bolt carrier group picks
- 8.4%
- Median paid
- $132
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 Aero Precision 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
Aero Precision Breach Small Levers
Fits both
Lower Receiver
Unconfirmed
Gas Block
Stock & Brace
Pistol Grip
Barrel
CMMG MK/4 Armor vs Aero Precision 5.56 BCG W/C158: specs and prices
| CMMG MK/4 Armor | Aero Precision 5.56 BCG | |
|---|---|---|
| Best price | $134.99 at Palmetto State Armory | $148.99 at KY Gun Company |
| Stores | 2 of 3 in stock | 0 of 6 in stock |
| Assembly | Stripped | n/a |
| Platform | AR-15 | n/a |
| Cartridge | n/a | 5.56 NATO |
| Finish | n/a | Black |
Both for $283.98 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.
- Aero Precision 5.56 BCG W/C158 Bolt: lowest $131.53 on Jul 6, highest $149.99 on Jul 12 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 Aero Precision 5.56 BCG W/C158 Bolt
Most picked next to it in real builds. Only parts our rules say fit the Aero Precision 5.56 BCG W/C158 Bolt are listed.
