Skip to main content
We may get paid by partner for deals, including promoted items

Menu

Trending
Top Brands Palmetto State ArmoryHot Yeti CoolerDeal NatchezDeal SitkaDeal 5.11Sale Winter Clearance Amazon Pickleball Sale Amazon FitnessHot Stores
BCM Standard 300 BLK Upper Receiver Group - 9in, MCMR-8, Standard by Bcm -

Price history at T.REX ARMS

Price at T.REX ARMS unchanged at $831.45 since Oct 9, 2026. Last checked Nov 8, 2026.

Product Description

Fully assembled 300 Blackout upper receiver with M4 feed ramps, chrome-lined bore, and M-LOK Picatinny section. Weighs 3 lb 1.6 oz. Ideal for suppressor use. Made in USA.

BCM Standard 300 BLK Upper Receiver Group - 9in, MCMR-8, Standard

at T.REX ARMS
Browse all T.REX ARMS deals
$831.45
In Stock at T.REX ARMS
Price checked 7 days ago
Buy Now at T.REX ARMS
Secure checkout Easy returns
or compare prices
Amazon logo Amazon eBay logo eBay

Product Details

Brand Bcm
Bcm

Price history at T.REX ARMS

Price at T.REX ARMS unchanged at $831.45 since Oct 9, 2026. Last checked Nov 8, 2026.

Shop more Bcm Gun Parts

All 155 in-stock Bcm Gun Parts from 7 stores →

More from Bcm

T.REX ARMS
Last Updated:
Nov 08, 2026 10:02 AM
BCM MK2 5.56mm Upper Receiver Group - 11.5 in, MCMR-10, Standard, Government BCM MK2 5.56mm Upper Receiver Group - 11.5 in, MCMR-10, Standard, Government View Details
$820.39
Buy Now · $820.39
T.REX ARMS
T.REX ARMS
Last Updated:
Nov 08, 2026 10:02 AM
BCM SOPMOD Bolt Upgrade/Rebuild Kit - AR-15 BCM SOPMOD Bolt Upgrade/Rebuild Kit - AR-15 View Details
$29.95
Buy Now · $29.95
T.REX ARMS
T.REX ARMS
Last Updated:
Nov 08, 2026 10:02 AM
BCMGUNFIGHTER Vertical Grip - Mod 3, M-LOK, Black BCMGUNFIGHTER Vertical Grip - Mod 3, M-LOK, Black View Details
$20.00
Buy Now · $20.00
T.REX ARMS
T.REX ARMS
Last Updated:
Nov 08, 2026 10:02 AM
BCMGUNFIGHTER Grip - Mod 3, Black BCMGUNFIGHTER Grip - Mod 3, Black View Details
$20.00
Buy Now · $20.00
T.REX ARMS
T.REX ARMS
Last Updated:
Nov 08, 2026 10:02 AM
BCMGUNFIGHTER KAG Angled Grip - M-LOK, Black BCMGUNFIGHTER KAG Angled Grip - M-LOK, Black View Details
$20.00
Buy Now · $20.00
T.REX ARMS
T.REX ARMS
Last Updated:
Nov 08, 2026 10:02 AM
BCM QD End Plate BCM QD End Plate View Details
$18.00
Buy Now · $18.00
T.REX ARMS
T.REX ARMS
Last Updated:
Nov 08, 2026 10:02 AM
BCM MCMR Quick Detachable Sling Mount - M-LOK BCM MCMR Quick Detachable Sling Mount - M-LOK View Details
$18.00
Buy Now · $18.00
T.REX ARMS
T.REX ARMS
Last Updated:
Nov 08, 2026 10:02 AM
BCM QD Sling Swivel - D Ring BCM QD Sling Swivel - D Ring View Details
$15.00
Buy Now · $15.00
T.REX ARMS
T.REX ARMS
Last Updated:
Nov 08, 2026 10:02 AM
BCM Cam and Firing Pin Replacement Kit - AR-15 BCM Cam and Firing Pin Replacement Kit - AR-15 View Details
$15.00
Buy Now · $15.00
T.REX ARMS
T.REX ARMS
Last Updated:
Nov 08, 2026 10:02 AM
BCM MCMR Rail Cover Kit - 5.5 inch, 5 Pack, Black BCM MCMR Rail Cover Kit - 5.5 inch, 5 Pack, Black View Details
$10.00
Buy Now · $10.00
T.REX ARMS
T.REX ARMS
Last Updated:
Nov 08, 2026 10:02 AM
BCM Flash Hider A2 - 1/2 x 28 BCM Flash Hider A2 - 1/2 x 28 View Details
$8.00
Buy Now · $8.00
T.REX ARMS
T.REX ARMS
Last Updated:
Nov 08, 2026 10:02 AM
BCM PNT Trigger Assembly AR-15 BCM PNT Trigger Assembly AR-15 View Details
$65.95
Buy Now · $65.95
T.REX ARMS
T.REX ARMS
Last Updated:
Nov 08, 2026 10:02 AM
BCM Mil-Spec Carbine Buffer System - H1 Buffer BCM Mil-Spec Carbine Buffer System - H1 Buffer View Details
$88.95
Buy Now · $88.95
T.REX ARMS
T.REX ARMS
Last Updated:
Nov 08, 2026 10:02 AM
BCM Mil-Spec Carbine Buffer System - H2 Buffer BCM Mil-Spec Carbine Buffer System - H2 Buffer View Details
$110.95
Buy Now · $110.95
T.REX ARMS
T.REX ARMS
Last Updated:
Nov 08, 2026 10:02 AM
BCM A/T Optic Riser - 525-13X5 BCM A/T Optic Riser - 525-13X5 View Details
$109.00
Buy Now · $109.00
T.REX ARMS
T.REX ARMS
Last Updated:
Nov 08, 2026 10:02 AM
BCM MK2 Buffer System - T1 Buffer BCM MK2 Buffer System - T1 Buffer View Details
$151.90
Buy Now · $151.90
T.REX ARMS
T.REX ARMS
Last Updated:
Nov 08, 2026 10:02 AM
BCMGUNFIGHTER AR-15 Enhanced Lower Parts Kit - Black BCMGUNFIGHTER AR-15 Enhanced Lower Parts Kit - Black View Details
$119.95
Buy Now · $119.95
T.REX ARMS
T.REX ARMS
Last Updated:
Nov 08, 2026 10:02 AM
BCMGUNFIGHTER SOPMOD Stock - Mod 0, Black BCMGUNFIGHTER SOPMOD Stock - Mod 0, Black View Details
$57.95
Buy Now · $57.95
T.REX ARMS
T.REX ARMS
Last Updated:
Nov 08, 2026 10:02 AM
BCMGUNFIGHTER Stock - Mod 0, Black BCMGUNFIGHTER Stock - Mod 0, Black View Details
$55.95
Buy Now · $55.95
T.REX ARMS
T.REX ARMS
Last Updated:
Nov 08, 2026 10:02 AM
BCM MK2 Buffer System - T2 Buffer BCM MK2 Buffer System - T2 Buffer View Details
$211.30
Buy Now · $211.30
T.REX ARMS