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Lots of good options out there under the $200 price tag of the Colt. All of them sporting a 158 carpenter steel bolt, shot peened and HPT/MPI. I don't read many complaints about BCGs that are built to those specs. I agree with the person who said the primary reason to get the Colt is to have an all Colt upper, if that is important to you.
I just checked out the colt socom testing Molon did (tos). There's a few problems I have with that test:
1. It's a sample size of one. Maybe he just so happened to have gotten the cats meow of colt barrels.
2. Molon DOES NOT shoot factory loads in his tests. In fact I found a component list that he uses for reloading, and it's all top shelf components. Why is this so important? Pedigree handloads produce 1 moa out of most barrels. There's plenty of reports of guys getting close to moa with bcm and fn barrels WITH handloads.
I'm not saying colt is bad perse, as I have some time behind one. I just won't proclaim colt to be better than xyz. Especially since you mentioned a diet of m193. Not a match ammo. Expect 2-3 moa.
Back to the BCG question. Personally I'll spend the extra ~$40 and get a known quality bcg. Why? Because like others have said, the barrel and bcg are everything. I will cheap out on lowers and lpk (i got a great no name one from my lgs one time for $50) but the barrel and bcg HAVE to work.
"Just throw Krylon on it"
These threads never end
Last edited by Eurodriver; 03-12-15 at 15:48.
Why do the loudest do the least?
It's all about the odds. Odds are more Brand X cheap bolts are going to break at 5000 rounds than Colt, BCM or other quality make. Odds are more Colt, BCM or other quality make are going to last past 10,000 rounds without breaking than a cheap Brand X bolt. That extra $50-70 is not a lot compared to overall cost and well worth it to me.
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I think some anecdotal evidence is worthwhile in a discussion about BCGs. Since the bolt is the weak point in the design and most prone to breakage, I'll focus on that.
-The BCM Filthy 14 broke 2 lugs at 16,400 rounds. http://www.slip2000.com/blog/s-w-a-t...ine-filthy-14/
-Ruger claims it submitted three AR-556 (using 9310 bolts) for 20k round count testing. According to them 1 survived and the other two broke at around 19k rounds. https://www.m4carbine.net/showthread...60#post2001560
-Luckygunner's Steel vs. Brass cased ammo test involved 4 Bushmasters shooting 10k rounds each. Of the three that finished the test (the forth not finishing due to ammunition issues), none of them had any bolt breakages. http://www.luckygunner.com/labs/bras...el-cased-ammo/
-Battle Rifle Arms, somewhat infamous on the internet, submitted one of their rifles for a 10k test in a single day. The rifle was garbage and had multiple problems, however the 9310 Bolt survived despite 10k rounds in a seriously over-gassed rifle. http://www.thefirearmblog.com/blog/2...rifle-company/
-Guy reviews his M&P sport after 10k rounds. The bolt is still functional. https://www.youtube.com/watch?v=FXlHE5CHVB0
-The "SOPMOD PROGRAM OVERVIEW" publishes a document that discusses bolt failure (starting on page 44). They advise that bolts subject to a "harsh firing schedule" will show cracking between 3-6k rounds. A bolt with a "mild firing schedule" will show cracking between 6-10k rounds. It concludes "Once the Crack Is Initiated, the Bolt May Fail at Any Time, or May Last for Thousands of Rounds, Depending on Crack Propagation." These bolts were however subjected to full auto firing, so they are not directly comparable to civilian testing. http://www.dtic.mil/ndia/2006smallarms/taylor.pdf
Last edited by NWcityguy2; 03-12-15 at 20:22.
Awesome evidence!
I'm honestly shocked at how many 9310 bolts made it past 10k. Of course the sample sizes are still small, but it proves they CAN last.
"Just throw Krylon on it"
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