Frequently Asked Questions

Quad Rails, Keymods & Handguards

AR-15 Drop-in Questions

Will this drop-in quad rail fit on my “_____” AR-15? How do I know which size drop-in quad rail to buy for my rifle?

Why are some drop-in carbine length quad rails listed as 6.5”, 6.7”, or 7”? Which size should I buy for my rifle?

Will this mid/rifle length drop-in quad rail work fit with my triangular front end cap?

This drop-in quad rail is about ¼ inch too long. Why won’t it fit my AR-15?

AR-15 Free Float Questions

What is the difference between a drop-in and a free float quad rail handguard?

Will this quad rail work with a AR-10/.308 rifle?

Will this quad rail work with an Adams Arms gas piston system?

Will this quad rail work with the latest Bushmaster Carbon 15 Rifle?

What is the inside diameter of your free float quad rails?

What parts and tools are necessary for installing a free float quad rail handguard?

How do I install a free float quad rail handguard?

I would like to install a free float quad rail handguard that extends past the gas block and further down the barrel. How is this done?

Affiliate Program

General Info

How do I sign up for the Affiliate Program?

When and how do I get paid?