Please send us a e-mail including the item #'s for the (6) parts listed below.:
We will review your items to ensure fitment and send you a quote for your build.
1. Receiver
2. Handguard
3. Barrel
4. Gas Block - If using a low profile gas block, we only use item #750SLPGB-MN on builds.
5. Gas Tube
6. Muzzle Device
Disclaimer:
-All items purchased must be purchased from MAS Defense. We cannot install any third party parts per our insurance constraints.
-All items purchased to complete your barreled upper must be purchased at the same time including this assembly fee. Please do not place your order if a item is not in stock.
Thank You,
MAS Defense
Clean work 
