Now Available, B.A.R.T. 2.0 in M4E1 and M5E1 sizes to fit the new enhanced AR uppers. They will not properly lap the standard uppers so please use the standard-sized B.A.R.T. tools for that purpose.
All B.A.R.T. Combo Purchases include one (1) .4oz bottle of lapping compound at no extra cost.
Barrel And Receiver Truing Tool
B.A.R.T- 2.0 is a two in one tool. Inserted into the front end, the tool laps the face of your AR Uppers, ensuring a perfectly square and centered fit between your Barrel and Upper.
With the head of the tool secured in vise, insert the other (splined) end through the rear of the upper until the splines engage the lugs of the barrel. You are now ready to loosen or tighten the barrel nut, muzzle brake, or suppressors and install gas blocks with ease and confidence without any need to remove sights or optics.
There is NO OTHER tool on the market like it. This one tool does the job of TWO TOOLS, literally saving you $100 or more! If you build or own AR’s this tool is absolutely indispensable.
*NOTE: When lapping with the B.A.R.T. Tool, it is recommended to use a hand-driver and manually turn to lap your upper, and in a pinch, a power-driver/drill can be used with discretion (on low), but *DO NOT* use an impact driver as this can damage or break the bit extension on the B.A.R.T. Tool.
It is strongly advised to utilize the B.A.R.T. Tool in a horizontal fashion. Using it vertically in combination with lapping compound can allow the compound to run inside the upper receiver's bolt-carrier channel and cause the unintentional removal of anodizing in that location.
Check out our B.A.R.T. Tools featured in Guns & Ammo AR-15! (PDF)