The Seekins .223 DBM setups are pretty much impossible to get. Seekins is redesigning part of the magazine to allow short cartridges to feed better, so until that's done he's out of stock on them. I know this because he responded to a thread I made on Sniper's Hide about the setup. I was really bummed. Anyways, some guy in NJ PM'd me a few minutes later and said that he had a brand new .223 DBM setup from Seekins that he'd never gotten around to using, and he'd sell it to me for what he paid for it. I was like Inletting my stock was a pain in the ass because it's got a full length aluminum bedding block in it, so we had to cut that in addition to the fiberglass. Fortunately we had a die grinder with a carbide cutting bit, so that took care of the aluminum. The hard part was cutting the pillar area in the rear deeper. The die grinder wouldn't fit there, so I got a straight router bit and chucked it into my dad's drill press, and we used that like an end mill. In the end it worked out well and this thing feeds like a dream.