Recommended Budget parts
Rails:
UTG super slim
Omega MFG
Strike Industries
Stock:
Mission First Tactical BMS
Take down Pins:
YHM EZ Pull
Trigger Guard:
Phase 5 Tactical Winter guard
Gas Block:
Troy Low profile
Vector Optics Bolt on w rail
Parallax adjustable
Ejection Port Cover:
Strike Industries
Phase 5 Tactical
Grips:
Umbrella Corp Weapons Research Group
Muzzle Brake:
Troy Claymore
Lower & Upper receivers:
Palmetto State Armory
Aero Precision
Lower Parts Kit:
Palmetto State Armory
CMMG
Battery Assist Levers:
Dpms Tactical
Tactical link
A lot of great parts can be found on:
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Amazon & eBay
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& even websites like brownells & midwayusa from time to time
