MAS Defense is committed to providing you quality parts at reasonable prices. 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 needs and hope to become your one and only tactical weapon store. Contact us directly with any questions or to discuss your build.
All of our inventory is live data. If a part shows in stock, we have it in stock. We do not believe in "Back Ordering" parts and will NEVER sell any part that we do not have in stock. Barreled Uppers are built to order. Parts will ship in approximately 1-2 business days. Barreled Uppers will ship in approximately 4 business days. Local Pick Up is available in Charlotte, NC. We do ask that you call before stopping by as we are not a "come in and browse shop".
Please click the links above or to the right to shop.
In Stock Specials
- 10.5" 300 BLACKOUT 1x8 Barrel $159.99 - Please see our barreled uppers.
- 10.5" 5.56 1x7 M4 Contour Barrel $139.99
- 16" 5.56 1x7 M4 Contour 4142 Hardened Steel Barrel ***SALE $114.99***
- Seekins SP223 Billet Upper Receiver - ***SALE $199.99***
- NP3 Technology Bolt Carrier Group (No Lube) - $149.99
- 7.5", 10.5" & 16" .223 Wylde 1x7, 1x8 & 1x9 Barrels (These can fire 5.56) Starting at $99.99
- Barreled Uppers available in any configuration. Please call to discuss.
- Check out "Working Mans Parts" for discounted blems.
New Parts Added
- ***10.5" 5.56 1x7 Twist 4142 and Melonite Nitride Barreled Upper Option***
- Diamondhead Nite Brite Polymer Flip Up Sights
- WMD M16 Profile Nickel Boron Bolt Carrier Group
- 14.5" 5.56 1x7 M4 Contour Chrome Moly Barrels
- 18" Stainless Steel Spiral Fluted Mid Length Barrel
- 20" Midweight 5.56 1x9 Rifle Gas System Barrels
- 9MM Barrels 5.5", 8.5", 10.5" and 16" Barrels
- 9MM Bolt Carrier Groups
- 16" 300 BLK 1x7 Mid Weight Stainless Steel Barrels
- 8.5" and 10.5" 300 BLK 4142 Hardened Steel and Melonite Barrels