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Build Kit · Assembled
- OVERVIEW - This Shooters Gate AR-15 Build Kit provides a solid Mil-Spec foundation for a dependable 300 Blackout build. It includes a Stripped upper receiver, a 16“ 300 Blackout barrel with a gas system (twist varies depending on the barrel), and a Black 15“ free-float M-LOK handguard for stability and accessory mounting. The kit also features a Bolt Carrier Group, made in the USA, standard charging handle, complete lower parts kit, and a Mil-Spec buffer tube assembly. Only a stripped lower receiver and magazine are required to complete the build. Show More ▼ Upper Receiver Stripped upper receiver Barrel 16“ 300 Blackout barrel (twist varies depending on the barrel) Dust Cover & Forward Assist Black dust cover Black forward assist Gas System Gas Block (diameter varies depending on the barrel) Gas Tube (length varies depending on the barrel) Muzzle Device A2 Bird Cage Flash Hider with crush washer Handguard Black M-LOK Free Float Handguard For 16“ Uppers there will be a 15“ handguard BCG & Charging Handle Bolt Carrier Group, made in the USA Black standard charging handle Included Parts Mil-Spec Stock Mil Spec Buffer Tube Buffer Spring Buffer Castle Nut End Plate Included Parts Safety Selector Safety Detent Safety Detent Spring Trigger Guard Trigger Guard Roll Pin Pistol Grip Washer Pistol Grip Screw Buffer Retainer Retaining Spring Mag Release Mag Release Button Mag Release Spring Takedown Pins (x2) Takedown Springs (x2) Takedown Detents (x2) Hammer Spring Hammer Pin Trigger Spring Trigger Pin Bolt Catch Bolt Catch Plunger Bolt Catch Spring Bolt Catch Roll Pin Disconnector Disconnector Spring Trigger Guard Screws Trigger Hammer AR-15 Pistol Grip What You Still Need AR-15 Stripped Lower Receiver (FFL & Background Check required) Magazine suitable for your desired caliber ⚠ WARNING: This product can expose you to chemicals such as lead and other petroleum products which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.p65warnings.ca.gov
Build Kits · Unassembled
Forged 7075-T6 Upper Mil-Spec stripped upper receiver (black) 16" 5.56 NATO Barrel 1:8 twist, mid-length gas (optimized for 55–77 gr) 15" Free-float Handguard M-LOK compatible for accessories and rails USA-Made BCG Bolt carrier group manufactured in the USA Complete Lower Parts Kit Trigger, pins, springs, hammer — ready to install Mil-Spec Buffer Tube & Spring Carbine buffer and spring included Platform AR10, AR15, M4, M16, M110, SR25 Compatibility Mil-Spec carbine receiver extension (not included) LOP (Collapsed / Extended) ~10.3" / ~13.6" Adjustment Range 3.3" Size Length: 6.5" | Height: 4.2" Weight 7.9 oz (11.9 oz w/ tube)
Build Kit · Assembled
- OVERVIEW - This Shooters Gate AR-15 Build Kit provides a solid Mil-Spec foundation for a dependable 5.56 NATO build. It includes a Stripped upper receiver, a 10.5" 5.56 NATO barrel with a gas system (twist varies depending on the barrel), and a Black 10" free-float M-LOK handguard for stability and accessory mounting. The kit also features a Bolt Carrier Group, made in the USA, standard charging handle, complete lower parts kit, and a Pistol buffer tube assembly. Only a stripped lower receiver and magazine are required to complete the build. Show More ▼ Upper Receiver Stripped upper receiver Barrel 10.5" 5.56 NATO barrel (twist varies depending on the barrel) Dust Cover & Forward Assist Black dust cover Black forward assist Gas System Gas Block (diameter varies depending on the barrel) Gas Tube (length varies depending on the barrel) Muzzle Device A2 Bird Cage Flash Hider with crush washer Handguard Black M-LOK Free Float Handguard For 10.5" Uppers there will be a 10" handguard BCG & Charging Handle Bolt Carrier Group, made in the USA Black standard charging handle Included Parts Pistol Buffer Tube Buffer Spring Buffer Castle Nut End Plate Included Parts Safety Selector Safety Detent Safety Detent Spring Trigger Guard Trigger Guard Roll Pin Pistol Grip Washer Pistol Grip Screw Buffer Retainer Retaining Spring Mag Release Mag Release Button Mag Release Spring Takedown Pins (x2) Takedown Springs (x2) Takedown Detents (x2) Hammer Spring Hammer Pin Trigger Spring Trigger Pin Bolt Catch Bolt Catch Plunger Bolt Catch Spring Bolt Catch Roll Pin Disconnector Disconnector Spring Trigger Guard Screws Trigger Hammer AR-15 Pistol Grip What You Still Need AR-15 Stripped Lower Receiver (FFL & Background Check required) Magazine suitable for your desired caliber ⚠ WARNING: This product can expose you to chemicals such as lead and other petroleum products which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.p65warnings.ca.gov
Build Kits · Assembled
Upper Receiver Black Forged 7075-T6 Mil-Spec Stripped upper receiver Barrel 10.5" 5.56 Nato barrel Dust Cover & Forward Assist Black or Matched-color dust cover Black or Matched-color forward assist Gas System Gas Block (diameter varies depending on the barrel) Gas Tube (length varies depending on the barrel) Muzzle Device A2 Bird Cage Flash Hider with crush washer (Our Round Muzzle Brake will be attached to uppers going to California to comply with local laws). Muzzle device will be parkerized or stainless steel (it will match the barrel material). Handguard Black or Matched-color M-LOK Free Float Handguard For 10.5" Uppers there will be a 10" handguard Bolt Carrier Group & Charging Handle Full-auto bolt carrier group, made in the USA Black standard charging handle Twist Ratios 5.56 Nato Barrels are 1:7 Twist What You Still Need to Complete the Build You will still need an AR-15 Stripped Lower Receiver (FFL & Background Check required) Magazine You will also need a magazine that is suitable for your desired caliber. Fit All platforms capable of accepting a mil-spec carbine extension Cavity Depth 6.0" Length 6.75", 7.6", 8.25", 8.75", 9.5" Strap Width 1.0" Weight 6.75 oz. Width [Max] 1.8" Product Includes SBA3 SB Tactical Pistol Stabilizing Brace Adjustable nylon strap Fit All platforms capable of accepting a mil-spec carbine extension Cavity Depth 6.75" Length 7.5" collapsed, 10.25" extended Strap Width 1.0" Weight 10.25 oz. Width [Max] 2.25" Product Includes SB Tactical SBA4 Pistol Stabilizing Brace Adjustable nylon strap Mil-spec buffer tube Fit All platforms capable of accepting a mil-spec carbine extension Cavity Depth 6.0" Length 6.2" brace only, 7.5" collapsed, 10.25" extended Strap Width 1.0" Weight 9 oz. Width [Max] 2.1" Product Includes SB Tactical SBA5 Pistol Stabilizing Brace Adjustable nylon strap Mil-spec buffer tube
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Real buyer comments from Shooters Gate customers - fast shipping, complete orders, and gear that works as expected.
Facebook Comment · Build Kits
★★★★★P. Certeza
My first 556 build, parts arrived three days after order, no missing parts, and build was completed during Memorial Day weekend.
Facebook Comment · First Build
★★★★★M. Price
Great build kit and fast shipping on top of a great price.
Facebook Comment · Value
★★★★★T. Amber
Just got my AK47 bell shaped muzzle brake — got here super fast and earlier than expected.
Facebook Comment · AK Parts
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FAQ
Quick answers on shipping, what you need to finish the build, and what to expect after checkout.
Orders ship directly from our Virginia warehouse. Most customers choose us because they want reliable processing, fast outbound shipping, and real tracking updates after checkout.
You will still need an AR-15 stripped lower receiver plus a magazine that matches your chosen caliber. That keeps the process simple and lets the rest of the kit ship directly to your door.
Restrictions may apply by state or product type. Please check your local laws before ordering. Shooters Gate only ships where legally allowed.
Our team can help with caliber, length, and general build compatibility questions before you place the order, so you can buy with more confidence and avoid mismatched parts.
Yes. Shooters Gate backs orders with responsive support from our Virginia-based team. If you need help with product questions, setup guidance, or fitment concerns, we are here to help.
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P. Frier
Just built 2 of your kits this weekend and they both fired and operated flawlessly. Awesome products!