Why are they ALL mid-length gas systems? 
:suicide:
They arenāt.
Strike that. I guess I meant anything non-NFA. Iām into NFA, being 07/02, but most of my customers are not. So with that course correctionā¦why are ALL the 14.5" and 16" factory KMR upper groups mid length gas systems? Sorry for the detour.
They still arenāt. 
(They just have the FSB installed with 7" KMRās.)
I missed that one however that still doesnāt answer my questionā¦why? I guess what Iām saying is 1 single upper among all those options? I could see it if they offered one carbine upper with a FSB and one with a LPGB upper in each barrel length maybe even std barrel only but none at all? Makes no sense to me. There are still plenty of people who prefer carbine gas systems.
Iām just curious if anyone knows why? BCM aināt talking on this one.
I love their stuff and tend to buy and recommend little else but this one stumps me.
I donāt understand.
You asked why they donāt make carbine length gas system uppers with KMR rails.
They do.
My guess is that mid length systems tend to run smoother and offer advantages over carbine length in the standard non-NFA barrel lengths (14.5" and 16") Additionally economies of scale says the more mid length systems they produce the less expensive they are and more profit they earn.
Following along with this Iāve read on this forum before that BCM is one of the major players who spent a lot of time and resources developing the midlength system with regard to what the gas port size should be so itās only logical to me that this is what theyāre going to build and offer.
Im sure they are basing their product line offerings relative to the number units sold in the past. If they overwhelmingly have sold mid length gas systems in these barrel lengths as opposed to carbine, then why build both with a low pro gas block? One less item to build/stock.
I know they have put in a lot of R&D on the mid and that may just be the answer. It just surprises me for company as mil spec and TDP driven as BCM to virtually ignore those roots and that segment of the market.
Iāve got a BCM 14.5 and 16 mid and Iām not that thrilled with how they run. I know everyone is hot shit on the mid but itās just not there for me. Iām probably the minority which usually the case. I just have a hard time believing that Iām the only one who just doesnāt care for the mid.
I put this question to BCM specifically about the barrels. I got crickets in return.
I was genuinely curious to see if there might be anyone here with more āinsideā rationale to this philosophy. Itās really not that big a deal, I can use BCM upper components and a FN barrel but it tends to be more expensive.
āTrying to understand whyā certain things are the way they are has caused me a lot of consternation in life. Canāt yāall tell? Lol.
They donāt ignore those roots. You can get a 20" rifle and 14.5"/16" carbine upper no problem.
But once you step out of that standard setup with enhanced profiles, low profile gas blocks, KMRās/Free-Floatāsā¦ going for a mid-length is no more non-standard than anything else.
And as was mentioned, you can get a carbine with a KMR and A2 FSB. Great upper.
So, canāt tell you why BCM does what they do, but if you polled the consumers, the mid-lengths would likely be more popular. Might actually be an interesting poll to have hereā¦ One of their most popular uppers seems to be the 16" mid-length ELW with a KMR13. If they made the same profile for a carbine barrel, and offered the same setup with a carbine gas system, would most people want it more than the mid-length? Iād bet no. But like I said, could be an interesting poll.
Youāre a ābuild it myself guyā and thats ok! 
The answer youāre getting as simple as it isā¦is THE answer. BCM is all about the mid-length as has been covered here for years by pretty much everyone. That said, yes your statement above definitely puts you in the minority.
From a performance perspective, what exactly arenāt you thrilled about that the standard carbine offers over the mid?
What was your issue, and why would you prefer carbone length?
To me the reason is obvious. BCM want s to make a better product. Mid length is better, it shoots softer and unlocks the bolt later with less stress on the bolt.
Thatās all win, why would you sell an infirior product if the better one costs no more?
What does this have to do with the Technical Discussion Area?
To answer both of the above, Iāve compared my mids to the exact same setups with carbine gas systems and even with good AGBs, the mids still beat the shoulder more and are hard to keep on target. For the record, Iām not going to the A5. Nothing against it but I shouldnāt have to replace everything in the gun to get āthe better systemā to actually run better.
Once I tune it to run nicely, itās unreliable otherwise, itās hard and over gassed.
I know theyāre all about the mid and I do understand that once you get into these non standard configurations that all bets are off. I just donāt get it and was curious if anyone had more insight.
Iām wrong. Iām ok with that.
I figured it would degenerate into a āmid is better becauseā¦ā discussion despite how it started. Feel free to move it if needed. Sorry IG.
Iāve had a few BCM 14.5 and 16" mids, theyāre really not much softer or smoother than a Colt 16" carbine to me.
I wouldnāt, and donāt know anyone who would, buy a KMR upper with a 16" barrel and carbine gas. Is just doesnāt make sense.
Typically, for me, Iād put a SLR AGB on it. My contention is that a down gassed CAR feels better than any mid Iāve ever tried. I can build it up but itās been cheaper to by the factory unit with BCG and CH then add the AGB.
Im confused here. Are you saying that a 16 inch carbine system is smoother/less overgassed than a middy or that your carbine gas with an adjustable gas block is smoother than a middy?
If itās the first one then I disagree. I use a Colt 6920 at work and have owned one for many years. I also own two BCM middies and they do shoot smoother though not a big difference to me and basically is a moot point in my opinion/experience. If its the second one then of course it does.
Iām just saying that so far my experience has been with a small gas port or a AGB on a 14.5 or 16 CAR, the gun runs better than any mid Iāve shot even putting an AGB on the mid. With BCM offering some of the best gassed barrels on the market, Iām just surprised theyāre not offering more options in the CAR gas system.
Like I said earlier, Iāve found 2 identical 14.5 rifles with SLR AGBs, I CAR and 1 MID, the CAR runs better and if I adjust the MID to where the recoil impulse feels good, it was unreliable.
Thatās all Iām saying.
Mods,
Please close and remove this thread. I donāt want it to become a bad thing. I think the query was misperceived from the outset. Thanks so much to all who offered theyāre opinions.