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Quarter Circle 10 is pleased to present our new Stripped Upper & Lower Matched Sets, providing a convenient and cost-effective way to purchase the two central components of your next pistol caliber build. Shipped with a matching QC10 Pistol MUR upper receiver and the stripped lower of your choice, this is the easiest and most wallet-friendly option to start building. Whether you want the solid simplicity of the CLT9MM, the dependable compatibility of the GSF, or the big-bore power of the GLF, you can now pair one with a purpose-built QC10 upper at a substantial savings with our Stripped Upper & Lower Matched Sets. There’s no limit to the customization potential available to the QC10 user, as Quarter Circle 10 strives for the broadest possible compatibility with  aftermarket AR-15 components, from triggers to buffer springs to forends.

Our most popular model, the GSF, or Glock Small Frame lower receiver, is now available here as a Stripped Upper & Lower Matched Set. Both components are engineered around the pistol calibers you depend on, and are guaranteed to perform flawlessly together and with all our QC10 components. Now, you can own a pistol-caliber platform with the peace of mind of knowing that every component is of the highest quality. Whether for home-defense, law enforcement, competition, or plinking, Quarter Circle 10 has you covered, with our philosophy of Made For- Not Modified. Each of our parts is engineered and manufactured with pistol calibers in mind, rather than modified from rifle-caliber components as an afterthought. We’re Quarter Circle 10, the AR Pistol-Caliber brand.

Kershaw Launch 1 Auto Knife

Due to the many and varied Federal and State laws that govern the purchase, owning, and transportation of automatic knives, Kershaw Automatics will be sold only through authorized Kershaw dealers. They are not available for purchase on this website; this webpage is for information only.

Got an automatic attraction? Then look into Kershaw's new Launch 1. This automatic knife features CPM154 blade steel, a strong opening kick, and is made-in-the-USA at Kershaw’s Tualatin, Oregon manufacturing facility.

The CPM154 powdered metallurgy blade steel has more uniform distribution of carbides—so it takes and holds an excellent edge. It also provides good corrosion resistance, wear resistance, and toughness. The blade is finished with our BlackWash finish for rough-and-tumble good looks and an additional measure of blade protection.

To lighten the Launch 1's weight, the handles are durable anodized aluminum and are contoured to fit snugly in the hand.

The Launch 1 opens with a push button, which is recessed so that it is level with the flat of the handle. This is a safety feature and makes it harder for the knives to accidentally deploy. Nevertheless, automatic knives are dangerous and should be handled with extreme caution in all circumstances.

The Launch 1's pocketclip is left/right reversible. For left-handed use, use your index finger instead of your thumb to press the blade-release/lock button.

Comply with all local, State, and Federal regulations regarding the purchase, owning, carrying, and transportation of automatic knives.

Alpha Epsilon Systems AR15 Lower Receivers
CNC machined from 7075-T6 aircraft grade aluminum Reinforced in key areas and features an integrated upper receiver tension post to eliminate any unwanted movement between the upper and lower receivers. Integral Trigger Guard, Mil-Spec, Black Hard Coat Anodized. Magwell features an enlarged bottom flare and inner chamber for easier magazine insertion.
The ELF Drop-In Match Trigger has been built for performance.  The only AR15 trigger using aerospace grade sealed bearings, making for an incredibly smooth and fast trigger pull.  Pull weight is so easy to adjust it can be done in seconds without removing the trigger from your lower receiver.  A second-tonone AR-15 drop-in trigger system that is strong and light,  made of wire EDM machined, hardened A2 tool steel and lightweight aircraft-grade aluminum. Installation can be done in minutes using your AR’s original hammer and trigger pins. The match trigger may be ordered with a curved or straight shoe. The amazingly short take-up, glass-rod crisp break and next to zero overtravel can be compared to the finest custom 1911 triggers. Adjustability puts you in charge based on your current use. If you are looking for the finest adjustable trigger for your AR-15 platform, this is the trigger system for you
Elftman Drop in AR15 Match Triggers
  • Fits any mil-spec AR-15 (Large pin Colt available) 
  • Absolutely Drop-Safe regardless of pull-weight 
  • Factory set Pull-weight is approximately 50% lighter than that of a standard AR-15 trigger, providing a great  combination of speed and accuracy 
  • Adjustable from 4lbs to 2 1/2lbs  without removing from lower 
  • Full power hammer spring ensures proper ignition of primer 
  • Very short pull and reset allows for rapid follow up shots and greater accuracy 
  • Sturdy trigger assembly designed for rugged, trouble-free use; Made of lightweight aircraft-grade aluminum and hardened steel 
  • Unique design of disconnect allows full 1/4” width eliminating possibility of wear and double-firing 
  • High performance trigger and hammer needle bearings for smoother and faster firing Benefits a wide variety of AR-15 enthusiasts, including collectors, competitive shooters, hunters, military, law enforcement, and disabled veterans 
  • 100% made in America with a Lifetime Guarantee!

Nitecore’s new SRT series is the world’s first line of flashlights to feature third generation SSR (smart selector ring) technology, offering infinitely variable brightness adjustment and unprecedented ease of use. The SSR interface allows users to select modes and brightness levels by simply rotating a smooth selector ring which serves as a magnetic inductor.

The SRT7 is equipped with a unique multi-colored warning / hazard mode, which displays a rapidly alternating pattern of red, blue and green, making it an ideal tool for emergencies, police inspections or for traffic control.

This industry-leading design is both user-friendly and extremely durable, making it ideal for law enforcement and tactical applications. The SRT series is Nitecore’s crowning achievement and is yet another example of why Nitecore is fast becoming the world’s most innovative flashlight manufacturer.


  • LED: CREE XM-L2 T6
  • Battery: 1 x 18650 or 2 x CR123A
  • Output: .1-960 Lumens variable outputs
  • Runtime
    • 960 Lumens: 1 H 45 Min
    • 0.1 Lumens: 200 H
  • Max Throw: 337 yards
  • Peak Beam Intensity: 23256 cd
  • Blinding 960 lumens with 337 yard throw
  • Continuous brightness adjustment from 960 lumen to 0.1 lumen
  • Red, Green, and Blue LED functions for versatile applications!
  • Easy to use Smart Selector Ring to choose brightness and LED light color
  • IPX-8 waterproof rating

Content in Package

  • SRT-7 Flashlight
  • Holster
  • Removable Clip
  • Tactical Ring
  • Lanyard
  • Spare Tail Cap Button and O-ring

The MEGA ARMS MA-TEN (.308) Billet Matched Upper & Lower Sets offer the best possible configuration for that .308 Tactical Rifle Build out. The MA-TEN Set is machined so that the machine lines on the lower mate up to the machine lines on the upper making the MEGA MA-TEN one of the best looking options for your Heavy Black Rifle build out.

Monarch Glock 43 Trigger

Hyve Technologies is proud to bring our Monarch Trigger System to everyone! Our trigger and safety are, of course, machined from solid aluminum bar stock and then anodized in each of our seven colors. In addition our trigger system comes with a trigger bar and is fully adjustable for Pre-travel and for the Reset via Allen screws on the front and back of the trigger. As with all of our parts, the Monarch is 100% made in the USA.