BCM Standard 300 BLK Upper Receiver Group
What’s Included | Specs | Pictures | Restrictions
BCM’s Standard Upper Receivers are our baseline for price and performance, and their 300 Blackout models are no different. The continuous taper barrel profile found in these uppers provides excellent weight balance, keeping weight back towards the rear of the gun. This makes these uppers balance exceptionally well when paired with a suppressor, allowing the front of the gun to stay lighter and be more maneuverable even with the added weight of a can. As with all BCM uppers, you can expect superior fit and finish with thermal fit tolerances that increase overall consistency and service life.
WHAT’S INCLUDED
- 1x BCM Upper Receiver with BCG
- 1x M-LOK Picatinny section
- 1x BCM M-LOK QD mount
SPECS
FEATURES
UPPER FEATURES
- Manufactured by Bravo Company MFG, Inc. (BCM)
- Fully assembled, headspaced, and test-fired
- M4 feed ramp barrel extension and upper receiver for reliable feeding
- T-marked upper receiver for easy configuration of tactical accessories
- Mil-Spec barrel steel (Certified Mil-B-11595E) for strength and durability
- Chrome bore and chamber for enhanced chambering, extraction, and reliability
- Manganese phosphate barrel finish for corrosion resistance
- HPT / MP Inspected barrels for quality assurance and flaw detection
BOLT CARRIER FEATURES
- BCM (MPI) complete bolt carrier group for AR-15, M16, or M4
- Parkerized exterior with chrome-lined inside carrier
- Machined to USGI specifications, Full Auto Profile
- M16/M4 carrier with Mil-Spec chrome-lined gas key
- Gas key heat-treated and chrome-lined, securely fastened with grade 8 fasteners
- Bolt assembly machined from Mil-Spec Carpenter No. 158 steel, shot peened
- Includes tool steel extractor and ejector
- Includes BCM extractor spring
- HPT (High-Pressure Tested) and MPI (Magnetic Particle Inspected)
- BCM test fires for function before shipping
UPPER SPECIFICATIONS
| Caliber | 300 Blackout |
| Barrel Material | 11595E Spec Steel |
| Barrel Finish | Manganese Phosphate (Mil-Spec A-A-59267) |
| Bore & Chamber | Chrome Lined |
| Twist Rate: | 1:7 |
| Gas System | Pistol |
| Muzzle Device | BCM® Comp Mod 1 (762/300BLK) |
| Muzzle Threads | 5/8×24 |
Made in the USA.
BUFFER RECOMMENDATIONS
INDEX:
Sprinco Hot White: In the middle of a standard carbine spring and the Blue spring, roughly 7-8% stiffer than standard.
Sprinco Blue: 15% stiffer than standard carbine springs.
Sprinco Green: Rifle length spring for A5/MK2 buffer systems.
| MK2 9″, MCMR-8, Standard Barrel – Continuous Taper Profile, Pistol Gas | |
| Unsuppressed Supersonic | Carbine: H1 or H2 – Standard or Sprinco Hot White Spring Vltor A5/BCM MK2: -A5H2/T2 – Rifle or Sprinco Green Spring Law Folder, Carbine: H1 or H2 – Standard Spring Law Folder, Vltor A5/BCM MK2: A5H1/T1 or A5H2/T2 – Rifle or Sprinco Green Spring |
| Suppressed Supersonic | Carbine: H2 or H3 – Standard or Sprinco Hot White Spring Vltor A5/BCM MK2: – A5H3/T3 – Rifle or Sprinco Green Spring Law Folder, Carbine: H1 or H2 – Standard Spring Law Folder, Vltor A5/BCM MK2: A5H2/T2 or A5H3/T3 – Rifle or Sprinco Green Spring |
| Suppressed Subsonic | Carbine: Carbine (3.0oz) or H1 – Standard Spring Vltor A5/BCM MK2: A5H1/T1 – Rifle or Sprinco Green Spring Law Folder, Carbine: Carbine (3.0oz) – Standard Spring Law Folder, Vltor A5/BCM MK2: A5H0/T0 or A5H1/T1 – Rifle or Sprinco Green Spring |
| 50/50 Subsonic / Supersonic Suppressed | Carbine: H1 – Standard or Sprinco Hot White Spring Vltor A5/BCM MK2: A5H1/T1 – Rifle or Sprinco Green Spring Law Folder, Carbine: Carbine (3.0oz) or H1 – Standard Spring Law Folder, Vltor A5/BCM MK2: A5H0/T0 or A5H1/T1 – Rifle or Sprinco Green Spring |
TECHNICAL SPECIFICATIONS
| Specifications | 9″, MCMR-8, Standard Barrel, Pistol Gas | 9″, QRF-8, Standard Barrel, Pistol Gas |
| Weight | 3 lb 1.6 oz with Radian Raptor | 3 lb 4.2 oz with Radian Raptor |
| Weight, Standard Lower – No Stock | 4 lb 13.1 oz with Radian Raptor | 4 lb 15.7 oz with Radian Raptor |
| Weight, Standard Lower – Law Folder, No Stock | 5 lb 8.2 oz with Radian Raptor | 5 lb 10.8 oz with Radian Raptor |
| Length, Upper Only | 17.75″ Muzzle Device to End Of Receiver | 17.75″ Muzzle Device to End Of Receiver |
| Length, Standard Lower – No Stock | 25.18″ Muzzle Device to End Of Carbine Extension | 25.18″ Muzzle Device to End Of Carbine Extension |
| Length, Standard Lower – Law Folder, No Stock | 26.38″ Muzzle Device to End Of Carbine Extension | 26.38″ Muzzle Device to End Of Carbine Extension |
| Length, Standard Lower – Law Folder, No Stock (Folded) | 19.69″ Muzzle Device to Furthest point | 19.69″ Muzzle Device to Furthest point |
PICTURES
RESTRICTIONS
For uppers with a barrel length of less than 16 inches, it is the buyer’s responsibility to be aware of all applicable laws and regulations regarding their purchase and ownership.
This product cannot ship to Washington State due to unconstitutional restrictions. Because we believe that all citizens should have the same rights, we will not make any exceptions for military, law enforcement, or government personnel.
BCM products cannot be shipped outside of the US.
