Originally Posted by AgentTikki
+1, spare parts always seem to find their way into a completely new rifle....
dunno how it works...just does....
Changing out the bolt carrier is np, but once you get a couple thousand rounds in your ar, I'd keep that bolt in the same ar, and just swap out the carrier so you can make the DD and BCM logos match to your rifle....should you care.
True, you'd rather not swap out a BCG after it's "mated" to the barrel/receiver for thousands of rounds. But since it's a good idea to have a spare why not get the BCM now. You need something. If you stumble across a DD before too many rounds I'd swap, if not, no big deal.
I went through this with my first upper, an ArmaLite. I bought a DD BCG as a spare but then thought why not use the better component. I had about 500+ rounds that way until I saw a deal on a DD upper minus BCG. So DD went in DD and ArmaLite back in ArmaLite. It all worked fine.
Funny how you stumble across things so I'd get the BCM BCG for now since you know you'll find a use for it if you replace it. And more on stumbling across things, a couple years later I found an ArmaLite stripped lower on sale at my LGS then bought an ArmaLite LPK at DSG Arms and now have almost a factory build.