All B.A.R.T. COMBO Purchases include one (1) .4oz bottle of lapping compound at no extra cost.
Step 1: Tighten BART's head in a bench vise on the "Flats" provided.
Step 2: Put barrel in upper. Slide barrel nut over barrel and finger tighten barrel nut to upper.
Step 3: Slide upper onto BART 2.0 until barrel extension locks onto the teeth
Step 4: Tighten barrel nut to upper with barrel nut wrench to specifications stated by handguard manufacturer.
High Quality BCG's & Bolts
If purchased with a proper-chambered/matching AR barrel on the same order, the bolt will be head-spaced to that barrel and that barrel will receive our 1MOA or better guarantee.