Does the CMMG 38CA61A AR MK3 Lower Parts Gun work with the Cryptic BCG?

Lower Receiver

CMMG 38CA61A AR MK3 Lower Parts Gun Builder KIT 308 Lower

from $39.42

Bolt Carrier Group

Cryptic BCG

from $265.99

CMMG lower and Cryptic Coatings bolt carrier group compatibility

Yes, they fit

The CMMG 38CA61A AR MK3 Lower Parts Gun Builder KIT works with the Cryptic BCG. 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 lower and Cryptic Coatings bolt carrier group

Backed by thousands of qualified builds that have both a lower and a bolt carrier group.

CMMG 38CA61A AR MK3 Lower Parts Gun
Of lower picks
0%
Median paid
$37
Cryptic BCG
Not in enough builds yet to report.

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 Cryptic Coatings bolt carrier group

The part builders pick most often in each slot alongside these two, checked against both. Parts that conflict are left out.

CMMG 38CA61A AR MK3 Lower vs Cryptic BCG: specs and prices

	CMMG 38CA61A AR MK3 Lower	Cryptic BCG
Best price	$39.42 at Classic Firearms	$284.53 at Primary Arms
Stores	7 of 9 in stock	1 of 2 in stock
Assembly	Parts Kit	n/a
Platform	AR-10	n/a
Caliber	.308 Win	n/a
Finish	Black	Titanium Nitride
Color	Black	n/a
Cartridge	n/a	.308 Win

Both for $323.95 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.

CMMG 38CA61A AR MK3 Lower Parts Gun Builder KIT

Classic Firearms$39.42
Primary Arms$42.99
Palmetto State Armory$43.89
Brownells$49.23
CMMG$49.95
Optics Planet$51.89

Cryptic BCG

Primary Arms$284.53
Optics Planetout of stock$265.99

Price history, last 90 days

CMMG 38CA61A AR MK3 Lower Parts Gun: lowest $35.95 on Jul 29, highest $58.99 on Jul 28 over the last 90 days.
Cryptic BCG: lowest $265.99 on Jul 21, highest $284.53 on Jul 7 over the last 90 days.

Bolt Carrier Groups most paired with CMMG lowers

The CMMG 38CA61A AR MK3 Lower Parts Gun is not in enough builds yet, so these are the most picked next to any CMMG lower. Only parts our rules say fit the CMMG 38CA61A AR MK3 Lower Parts Gun are listed.