Buy this now!! - Real Avid AR15 Master Bench Block

Bought this to assemble my wife's AR-15 that I am building her and could not have been more pleased. It has spots for all the relevant positions you'll need when building or maintaining and AR-15. The magnetic pin catcher makes it very convenient to have things held in place when you remove them, and the rubber base keeps it from sliding all over your bench. One thing that's not totally apparent from the description is the sheer size of this thing. It's not a tiny little block of plastic. It's wide enough to fit almost an entire lower receiver, and that's only half the block. It really gives you the space to work comfortably. For the money and even if you only occasionally work on an AR-15, it's worth the purchase.