There's a thread about it in the site comments forum. I think it's being worked on. I started noticing it last night.
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Been running a DD BCG in my BCM SPR and it hasn't missed a beat. The DD unit seems to have all the bells and whistles that the BCM does and even has a nice little logo to tell others you have good parts under the hood.
I understand the OCD thing, but at the same time, as long as you are putting first rate parts in your gun, it shouldn't matter. Think of it this way, if you owned a Bushmaster, would your OCD prevent you from putting a DD BCG in it (assuming your OCD would allow you to own a Bushy).
There's no reason not to get the DD. It's in stock and free shipping.
Get the BCM carrier and put a DD bolt in it. You'll have good parts and matching logos.
i know that they are a little more expensive but i believe that grant has some colt bcg in stock...many believe them to be the best of the best...who knows but i love mine.
Try out that new Fail Zero Nickel Boron coated BCG for me :D