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This complete upper is chambered in 450 Bushmaster
This platform is built on a 18" Rifle Gas Mod HBAR Profile (416R SS) barrel with a 11/16X24 thread pitch.
Our 18" Direct Impingement Long Rifle run a Rifle Gas System to mitigate recoil and gas blow back.
All of our Bolt Carriers go through a R.E.M Polish process prior to Nitride coating. The R.E.M Polish process reduces friction, improves part durability, improves oil retention, and improves contact & bending fatigue. Our Bolts are MPI (Magnetic Particle Inspected) and coated in a durable Nitride finish.
The SPR-18L rifle runs our TYPE-A SPR-17 GEN3 MLOK Handguard which allows the shooter to full advantage of the rail.
The 450 Bushmaster round has grown immensely in popularity due to some state and local laws allowing straight wall cartridges for hunting in the shotgun zones. Please check with your local and state regulations.
Our 450 Bushmaster complete uppers can ship as a kit with our H3 Buffer and proprietary spring for recoil reduction. Kit or No Kit needs to be specified.

TYPE-A SIPR/18L GEN2 450BM COMPLETE UPPER (17″ HANDGUARD)

$993.00 – $1,087.00

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Description

We had two things in mind when it came to redesigning the SPR GEN3 Platform; weight reduction and functionality.  Our first improvement started with functionality on the lower receiver components.  We moved away from standard mil-spec components, upgrading to a ambi billet adjustable 90°/45° short throw fire selector, extended billet magazine release, improved pivot/breakdown pins, and most importantly stainless steel detents/springs/roll pins/trigger pins/etc.  Our second functionality improvement came from the upper receiver and since we were on a mission to make this rifle semi ambidextrous, we decided to upgrade to an ambi charging handle.  The next upgrade came in the form of weight reduction on the front end.  We made some weight improvements on our all new GEN3 SPR/17 handguard by opening up the offsets to accept M-LOK attachments and off-setting an optional 45° QD M-LOK insert towards the backend of the handguard.  The last upgrade was to improve the overall gas flow by making improvements to our gas management system from front to back.

This TYPE-A SPR-18L 450 is built on an accurate Long Rifle platform with proven mil-spec components to make it an incredibly versatile rifle. The SPR/18L 450 Long Rifle is equipped with a heavy Mod HBAR 18″ 416R Stainless Steel barrel (for improved accuracy) and a full 17″ free float rail (M-LOK – GEN3) with a Silencerco ASR muzzle brake to mitigate muzzle rise.  The TYPE-A SPR-18L 450 upper is driven by our TYPE-A QPQ coated bolt carrier group w/R.E.M. Polish. It’s also equipped with our improved TYPE-A PMC Straight 2-stage trigger to give it consistent reliability time after time.

NOTE:  All of our rifles are Hardcoat Anodized and then Cerakoted to give you a longer lasting more durable finish.  We wanted your rifle to wear to the anodized surface vs. the raw aluminum surface like some of our competitors.  Just another added benefit making our rifles…TYPE-A.

****Please Note: All NFA rules apply. Please check with your local state laws.

Colors Available (Shown in MAGPUL ODG)

  • Magpul™ Olive Drab Green (H-232Q)
  • Magpul™ Flat Dark Earth (H-267Q)
  • SIG™ Dark Grey (H-210Q)

Features

BARREL

  • Barrel

    • Caliber: 450 Bushmaster
    • Length: TYPE-A 18″ Mod HBAR Contour SS Barrel
    • Gas block: Low Pro Micro .750 Gas Block (Removable) – QPQ Nitride
    • Material: 416R Stainless Steel w/Extended Feed Ramps
    • Gas System: Carbine Length
    • Twist Rate: 1:24 twist
    • Finish: Bead Blasted
    • Thread: 11/16×24
    • Muzzle Device: Options
      • SILENCERCO ASR Muzzle Brake – 11/16×24

    Upper Receiver

    • Platform: SPR GEN3 Precision Machined 7075-t6 Aluminum Upper Receiver with Extended Feed Ramps
    • Finish: Option
      • Black – MIL-A-8625, Type-III, Class 2
      • Color – Type-III Anodizing with Cerakote Ceramic Coatings
    • Charging Handle: TYPE-A Ambi Charging Handle

    • Bolt Carrie Group: QPQ w/R.E.M Polish Carrier Group

    • Carrier:
      • QPQ Coated Semi-Auto Bolt Carrier
      • QPQ Coated Gas Key (Staked)
      • Gas Key Hardened to USGI Specifications
      • Grade 8 Hardened Fasteners
    • Bolt Assembly:
      • QPQ Coated Bolt – Case Hardened, Shot Peened & MPI Tested
      • Extractor (Fully Assembled)
    • HANDGUARD/RAIL
      • Platform: Option
        • TYPE-A SPR/17 GEN3 M-LOK Handguard
      • Finish: Option
        • Black – MIL-A-8625, Type-III, Class 2
        • Color – Type-III Anodizing with Cerakote Ceramic Coatings
    • Buffer/Spring: H3 Buffer & Proprietary Spring Kit (OPTIONAL)
    • Magazine: 1 ASC 5 Round Aluminum Magazine (INCLUDED)
    • Custom Modifications: Please Call/Email us for your custom variations.

    Colors Available

    • Magpul™ Olive Drab Green (H-232Q)
    • Magpul™ Flat Dark Earth (H-267Q)
    • SIG™ Dark Grey (H-210Q)

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