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Page AR-15 » AR-15 / M-16 Retro Forum
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Posted: 5/3/2016 6:04:27 PM EDT
Just wondering what kind of markings should be on the manganese phosphate finish bolt to go with the chrome bolt carrier 3/4 round key?  Would it be MP or MPC marked?
Link Posted: 5/3/2016 6:16:23 PM EDT
[#1]
MP marked like so:

Link Posted: 5/3/2016 6:18:24 PM EDT
[#2]
Discussion ForumsJump to Quoted PostQuote History


Once again sir you do not fail me in my time of need!!!!  Thanks!!!
Link Posted: 5/3/2016 10:09:11 PM EDT
[#3]
That looks a lot like the bolt that came in my 604 kit. Here's a pic of the carrier (no C stamp) and bolt. Speculation in the appraisal thread was that it might be H&R or Hydramatic.













 
Link Posted: 5/3/2016 10:18:52 PM EDT
[#4]
grondike, that is indeed an early Colt bolt. GM bolts have the MP joined together right above the extractor pin, H&R bolts have the MP sideways. All similar, but slightly different.

You can see the different MP bolts in the thread below.

Click me
Link Posted: 5/3/2016 10:22:50 PM EDT
[#5]
Awesome; thanks!
Link Posted: 5/4/2016 12:11:56 AM EDT
[#6]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
grondike, that is indeed an early Colt bolt. GM bolts have the MP joined together right above the extractor pin, H&R bolts have the MP sideways. All similar, but slightly different.

You can see the different MP bolts in the thread below.

Click me
View Quote


Great link!!!!!  Thanks!!
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