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Posted: 2/16/2017 7:25:19 PM EDT
[#1]
The most appropriate BCG for an XM16E1 is fully chromed, and is among the hardest to find. I do believe some late E1s came with a parked carrier (transitional BCG)--or maybe a complete parked BCG--but I think most people automatically connect the serrated chromed BCG with the early 603.
You'll also want a transitional bolt catch--another hard to find detail that really "makes" a nice clone. |
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Posted: 2/16/2017 7:29:48 PM EDT
[#2]
XM16E1
It all depends on which version (early or late) as to which BCG you will use. Personally, I did a late version and used a parkerized Colt M16 BCG.  Attached File |
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Posted: 2/16/2017 7:55:20 PM EDT
[#3]
Quote HistoryQuoted:
You'll also want a transitional bolt catch--another hard to find detail that really "makes" a nice clone. The transitional bolt catch was only used on SOME weapons in the 1964-1965 time frame, so unless you are doing a VERY EARLY XM16E1 complete with M VP 12 barrel, you really do not need the transitional bolt catch. Thst being said, they ARE really neat looking. |
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Posted: 2/16/2017 8:01:56 PM EDT
[#4]
Even though the chrome carrier is somewhat iconic, I think there were probably more rifles produced with the parkerized carrier. I dont know the exact date the switch was made though.
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Posted: 2/16/2017 8:19:22 PM EDT
[#5]
Quote HistoryQuoted:
Even though the chrome carrier is somewhat iconic, I think there were probably more rifles produced with the parkerized carrier. I dont know the exact date the switch was made though. I agree, and the rarity of the chrome serrated bolt carrier will attest to that. If I recall correctly, I read somewhere that the chrome serrated bolt carrier was manufactured for less than one year. But, yes, it IS the iconic part of an XM16E1. |
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Posted: 2/16/2017 8:34:11 PM EDT
[#6]
I vote chrome. It has the classic look. Chrome BCGS are the aviator sunshades of the RBR world.
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Posted: 2/16/2017 8:35:09 PM EDT
[#7]
I'm going for late '65 or '66 I think. If I go chrome it will be a modern BCG, which wouldn't be correct anyway.
Not sure what I want to do. After some searching, it looks like it may end up being NiB rather than chrome. 
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Posted: 2/16/2017 8:42:25 PM EDT
[#8]
Quote HistoryQuoted:
I'm going for late '65 or '66 I think. If I go chrome it will be a modern BCG, which wouldn't be correct anyway. Not sure what I want to do. After some searching, it looks like it may end up being NiB rather than chrome. In that time frame, you may be more correct going with the parkerized BCG. |
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Posted: 2/16/2017 8:42:39 PM EDT
[#9]
Quote HistoryQuoted:
I vote chrome. It has the classic look. Chrome BCGS are the aviator sunshades of the RBR world. 
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Posted: 2/16/2017 8:44:16 PM EDT
[#10]
Chrome for me, easier to clean, smooth running
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Posted: 2/16/2017 8:46:05 PM EDT
[#11]
Quote HistoryQuoted:
In that time frame, you may be more correct going with the parkerized BCG. It would save me money too. 
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Posted: 2/16/2017 8:53:47 PM EDT
[#12]
I picked up a parkd XM16E1 carrier for not too much last year, plus it's original rather than a modern stand in. Might want to post a WTB if you choose that route.
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Posted: 2/16/2017 10:17:42 PM EDT
[#13]
I went with chrome on my recent 604 build. just wanted something different since my two other retro builds have parked BCG's
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Posted: 2/16/2017 11:17:01 PM EDT
[#14]
Would a modern USGI nickel boron coated bolt carrier group work as a stand-in for the chromed bolt?
Very reasonably priced and on sale now at Fulton Armory. I bought one., |
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Posted: 2/16/2017 11:24:25 PM EDT
[#15]
Quote HistoryQuoted:
Would a modern USGI nickel boron coated bolt carrier group work as a stand-in for the chromed bolt? Very reasonably priced and on sale now at Fulton Armory. I bought one., 
Heres a nickel moron bolt and chrome carrier. |
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Posted: 2/16/2017 11:29:57 PM EDT
[#16]
Quoted:
I've grown bored with a run of the mill late 603 and I've decided to put together an XM16E1, but I don't recall what I should be using as far as a BCG. I'm not going for 100% correctness but I want it mostly right. I'm using an NDS XM lower, and a no drain hole FSB. Which BCG would be more correct? I did some searching but couldn't nail down a time frame for them. Did you check youngmanufacturing.net ? |
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Posted: 2/17/2017 1:35:17 AM EDT
[#17]
the xm16e1 had 3 carrier variations
chrome serrated parked serration w/ enlarged firing pin retaining hole w/o the C mark parked serration w/ enlarged firing pin retaining hole w/ the C mark depending on how early you want to go, you can't go wrong with any of those |
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Posted: 2/17/2017 8:23:07 AM EDT
[#18]
A nickeled coating always looks yellowish to me, while a chrome coat has a faint blue tint.
I'd rather use a parked carrier than nickel for that reason. |
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Posted: 2/17/2017 8:33:25 AM EDT
[#19]
Quote HistoryQuoted:
A nickeled coating always looks yellowish to me, while a chrome coat has a faint blue tint. I'd rather use a parked carrier than nickel for that reason. I don't disagree, but maintaining an NiB BCG sure is easier... |
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Posted: 2/17/2017 10:54:27 AM EDT
[#20]
Quote HistoryQuoted:
I'm going for late '65 or '66 I think. If I go chrome it will be a modern BCG, which wouldn't be correct anyway. Not sure what I want to do. After some searching, it looks like it may end up being NiB rather than chrome. Last fall I bought a Daniel Defense fully chrome m16 profile bcg directly from them for my xm16e1. It looks really good. It appears they are out of stock right now, but it could be worth waiting for instead of going with some other coating. |
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Posted: 2/17/2017 11:11:09 AM EDT
[#21]
Quote HistoryQuoted:
Last fall I bought a Daniel Defense fully chrome m16 profile bcg directly from them for my xm16e1. It looks really good. It appears they are out of stock right now, but it could be worth waiting for instead of going with some other coating. I didn't realize that they made a chrome M16 group, I may snag one sometime, thanks. |
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Posted: 2/17/2017 1:09:31 PM EDT
[#22]
I have an original XM16E1 chrome carrier with a parked bolt in my XM16E1.
The original carrier I got from Boywonder and it wasn't cheap, but I feel better knowing an original is in there. He has another one listed on Gunbroker. |
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Posted: 2/17/2017 1:59:01 PM EDT
[#23]
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Posted: 2/17/2017 2:02:39 PM EDT
[#24]
Quote HistoryQuoted:
When I built my XM16E1 a couple years back, I used a chrome BCG from Young Manufacturing. Pricey, but would rather have something new since all my retro rifles are considered to me as battle ready if need be. Are you saying that original USGI bolt carriers are NOT "battle ready"? |
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Posted: 2/17/2017 2:03:28 PM EDT
[#25]
Here is some xm16e1 goodness. Couple chromed xm carriers, couple narrow band bolts, and a couple sets near perfect no drain hole sets.
 Attached File |
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Posted: 2/17/2017 2:11:59 PM EDT
[#26]
Quote HistoryQuoted:
Are you saying that original USGI bolt carriers are NOT "battle ready"? Here we go...... knew was coming. No, that's not what I'm saying. I prefer some newer parts than previous older retro parts that I don't know there history or abuse if any. My comfort zone from past experiences. That's all. |
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Posted: 2/17/2017 2:15:06 PM EDT
[#27]
Quote HistoryQuoted:
Here is some xm16e1 goodness. Couple chromed xm carriers, couple narrow band bolts, and a couple sets near perfect no drain hole sets. https://www.AR15.Com/media/mediaFiles/61597/20170217-052755-148367.JPG Nice 
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Posted: 2/17/2017 3:43:57 PM EDT
[#28]
After the USAF and US Army noticed a lot of failures with bolts on the 601s and 602s especially, they did a joint study on what the problem was in the early 1960s.
It was posted here before, the fleet testing they did across wide samples of guns, complete with serial numbers, round counts, and failure points. This is where they discovered that 8620 hard chromed bolts were a bad idea, and contributed to the departure from 8620 and hard chrome plating of bolts. Hydrogen embrittlement from the hard chrome encouraged surface stress fractures, and 8620 was a steel selected for strategic reasons for the AR10, and was brought over for AR15 bolts, carriers, and extensions as well. Stoner himself said they started using a 9310 steel after that to address the fatigue problems with the tiny bolt, in a training session with UK MoD engineers. |
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Posted: 2/17/2017 4:05:07 PM EDT
[#29]
Quote HistoryQuoted:
After the USAF and US Army noticed a lot of failures with bolts on the 601s and 602s especially, they did a joint study on what the problem was in the early 1960s. It was posted here before, the fleet testing they did across wide samples of guns, complete with serial numbers, round counts, and failure points. This is where they discovered that 8620 hard chromed bolts were a bad idea, and contributed to the departure from 8620 and hard chrome plating of bolts. Hydrogen embrittlement from the hard chrome encouraged surface stress fractures, and 8620 was a steel selected for strategic reasons for the AR10, and was brought over for AR15 bolts, carriers, and extensions as well. Stoner himself said they started using a 9310 steel after that to address the fatigue problems with the tiny bolt, in a training session with UK MoD engineers. Good to know. I wasn't aware of this... |
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Posted: 2/17/2017 5:17:23 PM EDT
[#30]
Quote HistoryQuoted:
Here is some xm16e1 goodness. Couple chromed xm carriers, couple narrow band bolts, and a couple sets near perfect no drain hole sets. https://www.AR15.Com/media/mediaFiles/61597/20170217-052755-148367.JPG Braggart!
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Posted: 2/17/2017 9:48:27 PM EDT
[#31]
Quote HistoryQuoted:
Heres a nickel moron bolt and chrome carrier. That's a really stupid looking bolt. If I can't locate chomed carriers, the NiB might have to do for me. Or how about Brownells start selling some for their retro lineup? |
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Posted: 2/18/2017 12:08:05 AM EDT
[#32]
Quote HistoryQuoted:
That's a really stupid looking bolt. If I can't locate chomed carriers, the NiB might have to do for me. Or how about Brownells start selling some for their retro lineup? That would be nice, especially if they use the earlier style enlarged hole for the FPR. Just mark them in a very conspicuous manner. |
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Posted: 2/18/2017 12:33:50 AM EDT
[#33]
I've got one of these from PK http://www.pkfirearms.com/m-16-chrome-bolt-carrier-group have fired maybe a few hundred rounds with it with no problems as of yet.
Brownells has these http://www.avantlink.com/click.php?tt=cl&pw=55963&ctc=izar1s8r4200zk8a00y51&mi=10077&url=http%3A%2F%2Fwww.brownells.com%2Frifle-parts%2Fbolt-parts%2Fbolt-carrier-parts%2Fbolt-carriers%2Fm16-chrome-match-bolt-carrier-assembly-prod77828.aspx?avs%7cManufacturer_1=SMITH%2bENTERPRISE It would be cool to have a repro with a properly enlarged firing pin retaining pin hole. |
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Posted: 2/18/2017 12:48:03 AM EDT
[#34]
Tony's customs has the chrome carrier AND the chrome bolt for $149.95, which is the best deal that I have found:
http://www.tonyscustomsllc.com/product/bolt-carrier-complete-chrome/ |
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Posted: 2/18/2017 12:52:35 AM EDT
[#35]
Quote HistoryQuoted:
I've got one of these from PK http://www.pkfirearms.com/m-16-chrome-bolt-carrier-group have fired maybe a few hundred rounds with it with no problems as of yet. Brownells has these http://www.avantlink.com/click.php?tt=cl&pw=55963&ctc=izar1s8r4200zk8a00y51&mi=10077&url=http%3A%2F%2Fwww.brownells.com%2Frifle-parts%2Fbolt-parts%2Fbolt-carrier-parts%2Fbolt-carriers%2Fm16-chrome-match-bolt-carrier-assembly-prod77828.aspx?avs%7cManufacturer_1=SMITH%2bENTERPRISE It would be cool to have a repro with a properly enlarged firing pin retaining pin hole. Looks like it hasn't been staked at all. |
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Posted: 2/18/2017 12:53:33 AM EDT
[#36]
Quote HistoryQuoted:
Tony's customs has the chrome carrier AND the chrome bolt for $149.95, which is the best deal that I have found: http://www.tonyscustomsllc.com/product/bolt-carrier-complete-chrome/ That's not too bad. |
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Posted: 2/18/2017 7:08:52 AM EDT
[#37]
aimsurplus. $99 and up if your trying to save a dime.
http://www.aimsurplus.com/catalog.aspx?groupid=723&name=Bolts+%26+Bolt+Carrier+Groups |
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Posted: 2/18/2017 8:27:57 AM EDT
[#38]
Quote HistoryQuoted:
I don't disagree, but maintaining an NiB BCG sure is easier... Yes, certainly. I meant for aesthetic reasons, only. |
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Posted: 2/18/2017 2:13:23 PM EDT
[#39]
If you go with a parkerized carrier, I believe you will need to find a carrier with an enlarged firing pin retaining hole on the right side and no "C" stamped on the left side. The bolt should only have MP and not MPC. Colt started using the "C" when GM and H&R started producing the M16A1.
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Posted: 2/18/2017 2:22:06 PM EDT
[#40]
Would this work for a early XM?
http://www.stagarms.com/5-56-223-chrome-bolt-carrier-assembly-right-handed/ |
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Posted: 2/18/2017 6:49:59 PM EDT
[#41]
Anyone know of a source for a chrome BCG without forward assist serrations, other than Young Manufacturing? They're out of stock right now.
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Posted: 2/18/2017 7:12:07 PM EDT
[#42]
Quote HistoryQuoted:
If you go with a parkerized carrier, I believe you will need to find a carrier with an enlarged firing pin retaining hole on the right side and no "C" stamped on the left side. The bolt should only have MP and not MPC. Colt started using the "C" when GM and H&R started producing the M16A1. Correct. They are not terribly hard to find either compared to the chrome XM16E1 carriers. |
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Posted: 2/18/2017 9:31:12 PM EDT
[#43]
Quote HistoryQuoted:
Anyone know of a source for a chrome BCG without forward assist serrations, other than Young Manufacturing? They're out of stock right now. Yes, try Boywonder. He usually has a few original Colt. They usually go for around $130. Check with him on Gun Broker. |
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Posted: 2/23/2017 10:43:54 PM EDT
[#44]
Quote HistoryQuoted:
Would this work for a early XM? http://www.stagarms.com/5-56-223-chrome-bolt-carrier-assembly-right-handed/ Dang it!  I was wanting a Stag and got the PK instead. No complaints with the one from PK though. Just Stag didn't show any chrome BCGs or any chrome components on their site when I ordered, so I had to use option B.
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