BG Defense

Custom Built TYPE-A Rifles, Firearms

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This SPR-13.7 Short Stroke Piston Rifle is chambered in 5.56 NATO.
Built on a 13.7" light weight contour 416R stainless steel barrel with a 1/2x28 thread pitch.
The SPR-13.7 runs a patented "Bleed Off" gas piston system. Built gas pressure within the block is reduced only to the amount required to drive/cycle the carrier. All remaining gas is bled out of the block allowing the system to run cleaner and noticeably cooler. This will reduce your weapons recoil and eliminate blow back while running suppressed. This block is fully adjustable up to 30 positions allowing you to fine tune your system unlike most systems which only allows 3-4 positions.
The carrier is coated in Titanium Nitride while the bolt is coated in Nitride. Titanium Nitride (TiN) coating is a wear resistant, inert, and reduces friction. Titanium Nitride also reduces galling between sliding components and improves overall life.
The SPR-13.7 rifle runs our TYPE-A SPR-13.5 GEN3 MLOK Handguard which allows the shooter a shorter overall platform.
This rifle has an 13.7" 416R stainless steel barrel with an Silencerco ASR that is permanently affixed. This is done by pinning and welding the muzzle to achieve the over 16" barrel length requirements. Other muzzles options available upon request.
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.

13.7 PISTON CARBINE CONTRACTOR

$2,199.00

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Quick Specs

CALIBER: 5.56 NATO
CLASSIFICATION: Carbine
BARREL LENGTH: 13.7″
HANDGUARD: SPR/13.5 GEN3 MLOK
PISTON SYSTEM: 30 Position Adjustable Short Stroke
LENGTH: Mid
TRIGGER: 2-Stage
MUZZLE: ASR Pinned & Welded
BCG: Titanium Nitride Carrier/w Nitrided Bolt
OVERALL LENGTH: 31″ OAL
Ambi-Short Throw Adjustable
WEIGHT: Classified

 

Description

This TYPE-A SPR-13.7 GEN3 CONTRACTOR is built on a ridged piston platform with improved lower components to make it an incredibly versatile rifle. The SPR-13.7 CONTRACTOR is equipped with a 13.7″ 416R lightweight contour stainless steel barrel, an improved SPR/13.5 GEN3 MLOK Handguard with a ASR Ready muzzle brake that is permanently pinned & welded to give you a full 16″ platform.  Fully furnished with B5 furniture, and 30 round capacity magazines. The TYPE-A SPR-13.7 CONTRACTOR is driven by our TYPE-A Titanium Nitride carrier and a 30 position fully adjustable short stroke piston system.   It’s also equipped with our 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 finish vs. the raw aluminum surface.  Just another added benefit making your rifle….TYPE-A.

Colors Available (Shown in Armor Black)

Note: Any H-Series Cerakote can be sprayed.  There is a $30 up-charge if the color is not in our stock.

  • Magpul™ Olive Drab Green (H-232Q)
  • Magpul™ Flat Dark Earth (H-267Q)
  • Noveske™ Bazooka Green (H-189Q)
  • Tungsten (H-237Q)
  • SIG™ Dark Grey (H-210Q)
  • Multi-Tone FDE – Special
  • Armor Black (H-190Q)

 

Features

*(OPTICS/LIGHTS NOT INCLUDED)

BARREL

  • Caliber: 5.56 NATO
  • Length: TYPE-A 13.7″ Lightweight Contour Barrel
  • Block: 30 Position Adjustable Short Stroke Block
  • Material: 416R Stainless Steel
  • Piston System: Mid Length
  • Twist Rate: 1:7 twist
  • Finish: Matte Finish
  • Thread: 1/2×28
  • Muzzle Device: ASR Ready Muzzle Brake – 1/2×28 (Pinned & Welded)

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 CARRIER GROUP: TYPE-A TITANIUM NITRIDE BOLT CARRIER GROUP 
  • CARRIER:
    • Semi-Auto Bolt Carrier
    • Gas Key (Staked)
    • Gas Key Hardened to USGI Specifications
    • Grade 8 Hardened Fasteners
    • Finish: Ti Nitride
  • BOLT ASSEMBLY:
    • Case Hardened, Shot Peened & MPI Tested
    • Extractor (Fully Assembled)
    • Finish: QPQ

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 (3.5lb.)
  • Extension:Carbine 6-Position Buffer Tube W/Flat 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

HANDGUARD/RAIL

  • Platform: Option
    • TYPE-A SPR/13.5 GEN3 M-LOK Handguard (8.3 oz.)
  • Finish: Option
    • Black – MIL-A-8625, Type-III, Class 2
    • Color – Type-III Anodizing with Cerakote Ceramic Coatings

FURNITURE

  • Stock: B5 ENHANCED SOPMOD STOCK – BLK
  • Grip: B5 TYPE 23 P-GRIP – BLK

ACCESSORIES (INCLUDED W/RIFLE)

  • Magazine: MAGPUL PMAG 30 AR/M Magazine
  • Soft Case: 36″ Single Rifle Case
  • ****please note: All NFA rules apply. Please check with your local state laws.
  • ****Please note: Optic & Can not included

Colors Available (Shown in Armor Black)

Note: Any H-Series Cerakote can be sprayed.  There is a $30 up-charge if the color is not in our stock.

  • Magpul™ Olive Drab Green (H-232Q)
  • Magpul™ Flat Dark Earth (H-267Q)
  • Noveske™ Bazooka Green (H-189Q)
  • Tungsten (H-237Q)
  • SIG™ Dark Grey (H-210Q)
  • Multi-Tone FDE – Special
  • Armor Black (H-190Q)

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Adjusting Your Gas

"If you’re running a rifle with an adjustable gas block, consider the following process for finding your sweet spot. First, close the gas port almost all the way. This means bottoming out the gas port screw and then backing off ¼ turn. Then insert a 1-round mag and fire. If the round doesn’t eject, open the gas port screw another ¼ turn and repeat. Continue this procedure until the casing ejects and the bolt locks back on the empty mag. Once you get good ejection and bolt lock open, open the gas port screw one more ¼ turn. This is your minimum setting for reliable function. Beyond this, you’ll want to group tune the rifle. Your barrel will group differently based on gas setting. If you’re selected ammo is performing good at your minimum setting, then great. If not, then try firing 3 round groups in ¼ turn increments up to 1 whole turn. You should find some improvement in this range."

    -Jason Gady

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