BCM 14.5" M4 Upper

**DaBears_85** · 02-20-10, 11:41

Hello all, I've been considering putting a BCM 14.5" upper on my 6920 for awhile now and think I have finally decided to 'pull the trigger' on the idea, so to speak. Anyways what, if any, would be the drop-off in accuracy going from a 16" to a 14.5" upper? I'm assuming it would be negligable or no? Is there anything I'm missing as far as noticeable differences in ballistics going from the different lengths? Any input would be appreciated. Thanks...

**NoBody** · 02-20-10, 17:55

I have two BCM 14.5" carbines and the accuracy is very acceptable. I believe you lose something like 100fps muzzle velocity by going for 16" to 14.5". However, if you're really concerned about accuracy then get a Noveske.

**spamsammich** · 02-21-10, 01:49

I would keep the 6920 intact unless I needed a SBR for vehicle duty or clearing rooms, then I would get an 11.5" SBR upper from BCM. I played the 14.5" upper game and I'm done with pinned muzzle devices, I don't really notice the 1.2" difference in handling between my 16" middy and my pinned LMT.

**DaBears_85** · 02-21-10, 13:46

Originally Posted by spamsammich

I would keep the 6920 intact unless I needed a SBR for vehicle duty or clearing rooms, then I would get an 11.5" SBR upper from BCM. I played the 14.5" upper game and I'm done with pinned muzzle devices, I don't really notice the 1.2" difference in handling between my 16" middy and my pinned LMT.

Yeah that's a good point. I'm trying to get on the force here in Springfield but it's been a rather long process so far. I really like my 16", so I guess I'll wait till I actually get a LE job before I change my upper. When I do, and I'm confident I will, you think the 11.5 would be better than the 14.5?

**Robb Jensen** · 02-21-10, 13:51

Originally Posted by DaBears85

Yeah that's a good point. I'm trying to get on the force here in Springfield but it's been a rather long process so far. I really like my 16", so I guess I'll wait till I actually get a LE job before I change my upper. When I do though, you think the 11.5 would be better than the 14.5?

FYI if you become an LEO it doesn't exempt you from NFA. You won't legally be able to use a shorter than 16" barrelled upper on your 6920 lower without getting a tax stamp on a Form 1.

**DaBears_85** · 02-21-10, 14:55

Originally Posted by gotm4

FYI if you become an LEO it doesn't exempt you from NFA. You won't legally be able to use a shorter than 16" barrelled upper on your 6920 lower without getting a tax stamp on a Form 1.

Really? I did not know that. Is that on the federal level, or does it vary from state to state? Is getting a tax stamp a difficult process?

**Robb Jensen** · 02-21-10, 14:59

Originally Posted by DaBears85

Really? I did not know that. Is the not being exempt on the federal level, or does it vary from state to state? Is getting a tax stamp a difficult process?

Federal.

http://www.atf.gov/publications/firearms/nfa-handbook/