This SPR-18L Long Rifle 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 hand placement.
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.
This rifle runs our TYPE-A PMC Two-Stage Trigger. Constructed from pre-hardened 4140 this trigger is coated in Nickel Teflon to fight against friction and to ensure lubricity. The PMC Two-Stage Trigger ships at 1 1/2 reset to 3 1/2 trigger pull.




Quick Specs

CALIBER: 450 Bushmaster
GAS SYSTEM: Direct Impingement
TRIGGER: 2-Stage
MUZZLE: ASR Suppressor Ready
BCG: QPQ W/R.E.M Polish
FIRE SELECTOR: Ambi-Short Throw Adjustable
WEIGHT: Light as a Feather



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 font 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. Fully furnished with Magpul furniture, optic ready, and equipped with a 5 round capacity magazine.  The TYPE-A SPR-18L 450 Long Rifles 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)




  • Caliber: 450 Bushmaster
  • Length: TYPE-A 18″ Mod HBAR Contour Barrel
  • Gas block: Improved Flow Micro .750 Gas Block (Removable) – QPQ Finish
  • Material: 416R Stainless Steel
  • Gas System: Carbine Length
  • Twist Rate: 1:24 twist
  • Finish: Bead Blasted
  • Thread: 11/16X24
  • Muzzle Device: SILENCERCO ASR Muzzle Brake – 11/16X24

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)

Lower Receiver

  • Platform: SPR GEN3 Precision Machined 7075-t6 Aluminum Lower Receiver
  • Finish: Option
    • Black – MIL-A-8625, Type-III, Class 2
    • Color – Type III Anodizing with Cerakote Ceramic Coatings
  • Trigger: TYPE-A PMC 2-Stage Straight Trigger (3.5 lb.)
  • Extension: 6-Position Adjustable Buffer Tube – Carbine Length
  • Buffer/Spring: H3 Buffer & Proprietary Spring
  • End Plate: TYPE-A QD Single Point End Plate (4140 Pre-Hard)
  • Fire Selector: TYPE-A Ambi Billet 90°/45° Adjustable Short Throw Selector
  • Magazine Release: TYPE-A Extended Billet Mag Release
  • Lower Parts: Stainless Steel/Aluminum Detents & Springs


  • Platform: Option
    • TYPE-A SPR/17 GEN3 M-LOK Handguard (11.7 oz.)
  • Finish: Option
    • Black – MIL-A-8625, Type-III, Class 2
    • Color – Type-III Anodizing with Cerakote Ceramic Coatings


  • Stock: MAGPUL MOE® SL-K STK Carbine Stock – Mil-Spec Model BLK
  • Grip: MAGPUL MOE® K2+ Grip – BLK

Accessories (Included w/Rifle)

  • Magazine: 1 ASC 5 Round Aluminum Magazine
  • Soft Case: 36″ Single Rifle Case
  • Custom Modifications: Please Call/Email us for your custom variations.

Colors Available (Shown in MAGPUL ODG)

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


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Training – Dryfire

"Learning how to operate your rifle doesn’t need to be a costly nor a time consuming endeavor.  Live-fire range time is important. But if you do not have a surplus of time or reasonable access to a range, you can train about 75% of what you need in your own home.  Throw some dots/tape marks up on wall and get moving.  You can work on stance, grip, movement and transitions with only limited space.  Reloads are always time well spent and be sure to work both bolt lock and sustained reloads.  Working on multiple targets and learning how to drive your gun to see/acquire multiple targets are skills that needs constant attention.  So if you happen to have 10 extra minutes in your day, grab your rifle and a couple empty mags and go do work."

-Jason Gady