MAS Defense is committed to providing you quality products at an affordable price. Our foundation is built on excellent customer service, honesty and integrity. These simple guidelines are what has made MAS Defense the preferred company it is today. We strive to meet all of your AR15 needs and hope to become your one and only AR15 store. Contact us directly with any questions or to discuss your build. ***All of our inventory is live data. If it shows in stock, we have it in stock.***
Please click the links to the right or on the header above to shop.
***We are currently 3-4 days behind on shipping.***
8" 300 Blackout Barrels are in stock.
We can build any one of our 5.56 Barreled Uppers using
a 8" or 16" 300 Blackout barrel. We just don't have the
time to list them all on our site. In most cases, you can
add $29.99 to the cost of the 5.56 upper to have it built
in 300 BLK. Please give us a call to discuss.
- Nickel Boron Stripped Bolt Carrier $84.99
New Parts Added
- Check out "Working Mans Parts" for discounted blems.
- Sig SB15 Stabilizing Brace $129.99
- 8" 300 Blackout Chrome Moly Barrel $159.99
- A large variety of 8" 300 BLK Barreled uppers starting at $399.99
- 16" 7.62 x 39mm 1x10 M4 and HBAR Barrel $139.99
- 7.62x39mm Bolt Carrier Group $134.99
- Troy Medieval, YHM Annihilator, Predator Flash Hiders Start at $34.99
- Flip Up Sights - Magpul, A.R.M.S., Command Arms. Starting at $59.99
- Vortex SF-RD-AR15 Red/Green Dot Optic $169.99
- 3 Different Pistol Buffer Tube Kits Starting at $49.99
- Barreled Uppers available in any configuration. Please call to discuss.
- 7.5" 5.56 Melonite Nitride Barrels
- 10.5" 5.56 Melonite Nitride Barrels
- 16" 5.56 Stainless Steel Fluted Mid Length Barrels
- 8" 300 Blackout Melonite Nitride Barrels
- 14.5" 300 Blackout Barrels
- 16" 300 Blackout Melonite Nitride Barrels
- Magpul 30 Round Mags. Black, FDE, Window, Non-Window