New shorty M305 receiver "discolouration"/birthmark kinda thing... whats the deal?!

muscles1000

muscles1000

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New shorty M305 receiver "discolouration"/birthmark kinda thing... whats the deal?!

Edited for clarity.

Hungry here: those birthmarks can be caused by the parkerizing. You see, the heat treating can be 'spotty' and the parkerizing (phosphoric acid?) will take differently to various spots from goofy heat treating. No worries here! :D
 
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I can tell you what it is if you p.m. me. Let's just say, the receivers were welded and I'd rather not say online what the reasons for that are.
I just got a couple canam shorties as well, one is normal, one is welded, both seem functionally okay. The service? Matt and Paul were exemplary to deal with ;)
 
Wow. That certainly doesn't instill confidince to see discoloration like that. I would definitely ask CanAm to exchange it, and they generally have great service, so i wouldn't expect any issues.
 
I used to love listening to sting and the police when I was a kid

http://2.bp.########.com/_3nNkcQ1t7hM/R3-nZHo42tI/AAAAAAAACK0/m_OI8gGaJmo/s400/2753f.jpg

But I'm sure neither of those groups would have any interest in a receiver being sold with weld marks on it, they're just in it for the love of the music.
 
Rocket Surgery said:
I used to love listening to sting and the police when I was a kid

http://2.bp.########.com/_3nNkcQ1t7hM/R3-nZHo42tI/AAAAAAAACK0/m_OI8gGaJmo/s400/2753f.jpg

But I'm sure neither of those groups would have any interest in a receiver being sold with weld marks on it, they're just in it for the love of the music.
Click to expand...
Likely about as interested as CZ858 with weld marks.
 
Sting was probably an anti anyway

CanAm why don't you sell reloading gear? Is it because everything Lee makes turns brown on the west coast or because there's no money in it?
 
Hey WyJax come up to Ft Mac this end of July Hungry's puttin' on a M14s clinic for two days. Check out the events section. Its just 4.5 hrs from Edmonton
 
Very interesting find today with 4 different chinese factory 18.5" rifles
I dropped 2007 series bolt into mine, headspace with original bolt was a satisfactory 1.638 (or +8thou over .308go). So I swapped in a GI, would need MAJOR lapping to fit. So I tried a 2007 norc bolt..... She "just" closed on the .308 go guage :) . Verified 80% + lug bearing on both sides and woohoo I have a .308 match chamber 18.5" factory shorty :rockOn:
Tried 2007 bolts in a 3 more shorties and got similar results with all three.
Kinda interesting eh?
 
Not saying it will work on them all, but in these 4 , headspace was average 1.638" and now 2 just close on the clymer 1.630" , 1 @ 1.633" and the 4rth is 1.634"
You would need to strip the bolt and use headspace guages, and also verify even lug bearing at 80% + lug bearing both sides, verify safety bridge function with "new" assembled bolt, and bob's yer uncle ;)
 
M14Doctor said:
Not saying it will work on them all, but in these 4 , headspace was average 1.638" and now 2 just close on the clymer 1.630" , 1 @ 1.633" and the 4rth is 1.634"
You would need to strip the bolt and use headspace guages, and also verify even lug bearing at 80% + lug bearing both sides, verify safety bridge function with "new" assembled bolt, and bob's yer uncle ;)
Click to expand...

I have verified my 2011 Norc with it's factory bolt has right about 1.634 headspacing. It just has slight resistance on a clymer no-go. How do you go about checking the percentage of lug bearing. Also, what would be considered good, acceptable, or not acceptable with respect to lug bearing?
 
I used my clymer incremental guages.
As for checking lug bearing-
Degrease receiver lug recesses and bolt. Bolt should be stripped and dummy round or headspace guage in chamber.
Use a heavy jiffy marker in black or machinists blue solution on the bolt lugs, coating them evenly.
Once dry, install bolt and insert an appropriate size punch in the extractor hole.
Cam the lugs closed and shut 20 or so times and remove the bolt.
Inspect lug surfaces for even wear and the shiny surface should encompass at least 80% of the lug surfaces.
If a problem is indicated, lugs can be trued by lapping with a fine, grease based lapping compound, used very sparingly. Do not get it in the bolt roller ;)
Lapping will increase headspace and if a bolt is lapped to a particular receiver, it should remain in that receiver.
 
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