Bushmaster AR-15 A3 Upper Receiver Assembly 450 Bushmaster 20" Barrel
This drop-in A3 upper will mount to virtually any standard AR-15 mil-spec lower receiver. With a velocity of 2200 FPS, the Hornady 250 Grain SST/FT bullet in the .450 Bushmaster "Thumper" is designed for all large North American game. Though not a long distance cartridge, accuracy has proved to be exceptional out to 200 yards with felt recoil similar to a 20 gauge shotgun. Tubular aluminum forends allow the barrel to free float from the nut forward, and chrome lining in both bore and chamber makes for long barrel life and easy cleaning.
This upper receiver assembly comes complete with a charging handle, forward assist, ejection port cover, bolt and bolt carrier assembly. The upper also features a versatile flat top for mounting optical devices or accessories. Includes a 5 round magazine.
- Upper Receiver Type: A3 Flat-Top
- Barrel Length: 20"
- Barrel Contour: Not listed by manufacturer
- Barrel Material: Chrome Moly Steel
- Muzzle Thread Pattern: 11/16"-24
- Chrome Lined: Yes
- Barrel Finish: Black Matte
- Twist Rate: 1 in 24"
- Chamber: 450 Bushmaster
- M4 Feed Ramps: Not listed by manufacturer
- Muzzle Device: Izzy Muzzle Brake
- Gas System Length: Rifle
- Gas Block Diameter: Not listed by manufacturer
- Handguard: Free Float
- Sights: None
- Bolt Carrier Assembly Included: Yes
- Bolt Carrier Type: N/A
- Extras: 5-round magazine
Please Note: Installation of AR-15 upper assemblies with certain features including, but not limited to: flash hiders, bayonet lugs, and threaded muzzles may violate state and/or local laws.
Thank you! Your valuable feedback helps improve our product information and offering.
Bushmaster AR-15 A3 Upper Receiver Assembly 450 Bushmaster 16"...
Sale$619.99Save $40.00 (6%)
Hogue OverMolded Free Float Tube Handguard AR-15 Rubber
$80.96 - $89.96
Hogue Overmolded Beavertail Pistol Grip AR-15 with Finger Grooves
Sale — Select ItemsAdd to Cart for Price
$35.00 - $1,000.00
DPMS Upper Receiver Stripped AR-15 Low Profile Matte
Sale$79.99Save $9.00 (10%)
RCBS Die Locking Ring 7/8"-14 Thread
$3.59 - $11.99
Magtech Reloading Brass 32 S&W Long
$18.79 - $169.99
Hornady Reloading Brass 450 Marlin Box of 50
Tactical Solutions Trail-Lite Barrel Browning Buck Mark 22...
$203.95 - $250.00
Remington Express Ammunition 308 Winchester 150 Grain...
Sale$20.49Save $2.50 (11%)
AR-Stoner Magazine AR-15 5.45x39mm Russian 30-Round with Anti...
Norma USA American PH Ammunition 338 Lapua Magnum 250 Grain...
Sale$64.99Save $45.00 (41%)
Winchester Razorback XT Ammunition 308 Winchester 150 Grain...
$38.99 - $369.99
DPMS Lower Receiver Parts Kit AR-15
Sale$49.99Save $10.00 (17%)
Hornady Custom Ammunition 450 Bushmaster 250 Grain SST Flex...
Magpul Stock MOE Rifle AR-15, LR-308 Synthetic
AR-Stoner Magazine AR-15 450 Bushmaster 5-Round Stainless...
Remington Premier Ammunition 450 Bushmaster 260 Grain AccuTip...
Sale$29.99Save $3.50 (10%)
Hornady FTX Bullets 450 Bushmaster (452 Diameter) 250 Grain...
Hornady Custom Grade New Dimension 4-Die Set 450 Bushmaster