I just picked up a new BCM middy pieced together from a complete upper and lower, both from Grant. The upper consists of a 16” BCM lightweight BFH mid-length barrel with FSP, DD Omega 9.0 rail, and BattleComp 1.0 and standard BCM lower with Tango Down pistol grip. I added a BCM BCG, Gunfighter Mod 4 CH, Tango Down stubby VFG, DD A1.5 rear sight, and Magpul MOE stock to round out the package. I ordered it on Black Friday and had the upper and lower in hand in a little over a week.
Grant was great with answering all of my numerous questions along the way and was awesome in putting my order together. Quick turnaround, even with my particular component requests and fast shipping, which probably cost way more than the shipping charge. Great service and my only complaint is the probable impact on my savings account.
The primary purpose of this BCM is to answer a lot of my X vs Y features and manufacturer questions. My first AR is a DDM4 V5 with EoTech 512 absolute co-witnessed with Troy BUIS, and Troy rail covers. For my second AR, I wanted to try a BCM, LMT or Noveske, a FSP and fixed rear sight with lower 1/3 co-witness with an Aimpoint RDS, a compensator/brake, and a light-weight barrel. I plan on running it with the iron sights until cash frees up for either a T-1 or other Aimpoint RDS. After I get the RDS, I’m planning on putting these two up against each other in my own Daniel Defense vs. BCM challenge. Definitely not an apples to apples comparison, but I wanted to compare the features that I typically would get feedback like “it basically comes down to personal preference, but you can’t go wrong either way”. I want to try the different features head-to-head and hope to take both to a carbine class sometime next year and figure out what features I like best. I’m still pretty new to AR’s, so this is a very much a learning process for me.
I took both to the range today¸ where I had planned on sighting in the BCM and seeing how it ran with both XM193 and XM855, test it with different magazines, and test out the BattleComp. It ran flawlessly, even with the cheap 10 round metal ProMags that I need to use with the Lead Sled. I had a few malfunctions (FTF) when running the ProMags with my DDM4. Only ran through about 140 rounds, but I’m liking everything about it so far.
I didn’t intend on starting the “Daniel Defense vs BCM Challenge” today since I brought the DDM4 just to run some steel cased ammo through it and see how it did (first time running steel cased ammo through any AR). However, I couldn’t help but start comparing the two. Not an apples to apples comparison, since they both have (or eventually will have) much different components, but just initial/overall impressions. The BCM seemed to run much dirtier than the DDM4. I only went through 140 rounds today and there seemed to be noticably more carbon build-up and in more/different locations than I had noticed on the DDM4. For example, when I pulled the bolt, the curved portion of the bolt behind the gas rings was dry and caked with carbon. I know I lubed that area before shooting. I also noticed a lot of carbon on the buffer and in the buffer tube. I have not noticed that much carbon in the DDM4, particularly on the buffer and in the buffer tube. Neither affected function (I think the Filthy 14 was MUCH worse) and I’ll take it as a warning to be more aware of lube in future use.
I also noticed a difference in the ejection pattern between the two. The DDM4 ejection pattern with XM193 and XM855 was consistently to the 4-5 o’clock position whereas the BCM would consistently eject (with the same ammo) to around 2 o’clock position with dents on the side of the brass in about the same spot. Not sure if the difference in the ejection pattern and seemingly “dirtier” operation of the BCM are related. The BCM functioned just fine, so I assume it’s not a big deal.
I thought my DDM4 was pretty light compared to my friend’s Colt 6920, but the BCM is MUCH lighter than my DDM4. Yeah the DDM4 wears an EoTech and Troy rail covers and the BCM has a light-weight barrel, but still. I’m leaning toward the lighter weight and thinking of replacing the Troy rail covers on my DDM4 with the basic ladder covers. One minor thing that I noticed is that the anodized finish of the DDM4 appears more glossy/smooth and the BCM appears more flat/porous. The finish of the DDM4 seems to keep oil on its surface and the finish of the BCM seems to soak it in. Nothing that would affect function, at least I don’t see how it would, but just something I noticed.
One side note on the DDM4 and steel cased ammo. I ran 40 each of TulaAmmo 55 gr and 62 gr .223 Rem. On the 55 gr, the bolt failed to lock back after the last round half on half of the 5 round strings. The 62 locked back after the last round on all of the 5 round strings, but I got a failure to extract on the second round on one of the strings. I’ve read where the steel cased ammo tends to start jamming due to build-up of carbon around the casing in the chamber since the steel casing doesn’t expand like the brass casing. Not sure if that contributed to the failure to extract, but I assumed so since a likely cause would be the sticking of the spent casing in the chamber. The spent casing was about a third of the way out and I had a tough time pulling the magazine. I don’t think I will end up running steel cased ammo much, but I wanted to see how it performed. Is there any way to improve how steel cased ammo runs in an AR? At this point I think I'll likely stick with brass cased ammo, but just curious.
Overall, I think it’s going to be very tough for me to decide a “winner” for this challenge. I think it’s going to end up a preference for one of them for a particular application (say carbine training) and the other for another particular application (say USPSA rifle matches). It’s just that I have to try them both to satisfy my curiosity. I’m still curious as to carbine vs middy, trying Colt/LMT/Noveske, and a LMT SOPMOD/B5 stock, so there’s likely another future competitor, or two, for this challenge.
The competitors.
Dents/marks on brass from ejection from the BCM
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Originally Posted by northern1
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