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Damaged main screw boss

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Shamu View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: October 22 2018 at 11:48am
Wild thought!
Maybe it was done to warn possible future users that there was something wrong with them? The same idea as squashing time expired brass when dumping it in the brass bucket at the range.
Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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Goosic View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Goosic Quote  Post ReplyReply Direct Link To This Post Posted: October 22 2018 at 12:11pm
Take them to an engine rebuilding facility the does magnafluxing. It will find any hairline crack in the metal.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Honkytonk Quote  Post ReplyReply Direct Link To This Post Posted: October 22 2018 at 12:19pm
Goosic. It sounds like you dabble in welding. A simple dye pen (dye penatrant) check would detect a crack. I'm sure if you took it to a welding shop, they'd do it for free. It takes about 1/2. Spray on the dye. Once dry, spray on the developer. Easy peasey. Very accepted test.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Goosic Quote  Post ReplyReply Direct Link To This Post Posted: October 22 2018 at 1:59pm
I've been welding since I was ten. I was a certified bridge welder for a bit and I still totally forgot about the dye pen. I grew up around drag boats and circle boats. Someone was always punching a piston through the side of a block. After we repaired the block we would always magnafluxing it checking for any hairline crack.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Goosic Quote  Post ReplyReply Direct Link To This Post Posted: October 22 2018 at 2:10pm
Shamu. I almost got into a physical altercation years ago due to the anger I was accumulating watching a guy taking barrelled receivers and running the receiver through a bandsaw,some of them No1MkIII/* receivers. His excuse? "I can sell the barrels right now and make hundreds of dollars,got no time to unscrew the receivers,quicker to cut them up so I don't have any BATF issues". It makes no sense to me but I will wager a dollar bet those six receivers are fine and the guy who had them last messed them up so others couldn't prosper from them
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Canuck Quote  Post ReplyReply Direct Link To This Post Posted: October 22 2018 at 4:14pm
All 6 of these I have do not exhibit ANY wrenching tools used to remove a barrel. They seem in great shape with no cracks or stress marks, etc. It's a real head scratcher to be sure.
Castles made of sand slip into the sea.....eventually
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Honkytonk Quote  Post ReplyReply Direct Link To This Post Posted: October 22 2018 at 7:39pm
Yup. Dye Pen check. Quick, easy, accurate.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Canuck Quote  Post ReplyReply Direct Link To This Post Posted: October 22 2018 at 8:24pm
I'm on it.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote englishman_ca Quote  Post ReplyReply Direct Link To This Post Posted: October 23 2018 at 8:02am
Originally posted by Goosic Goosic wrote:

Closest tap and die to the ba threads will be 6×1.00mm. .

If I am not mistaken (I often am), the thread of that front trigger guard screw on the No.4 is 1/4" BSF (26tpi) and not metric or BA.

I have recovered receivers (MLE) where a badly fitting receiver wrench distorted the boss and made a flat one side of the hole. (tip - install a grub screw in the hole to prevent distortion).

I would be tempted to try to hold the receiver rock solid in a drill press or knee mill gently redrill with an end mill and then a short drill bit of the correct tapping size to bring the hole back to round and then try to retap. It might work, it might not.

If the boss is cut, yes, then weld the sucker up, drill and tap. Next problem then is to ensure that you are accurate where you drill the hole, it will effect the stocking up if off center.

Immerse the receiver in a water tray when welding to avoid disturbing heat treatment.

In effect, you bought six take off barrels.

These might be cast offs where somebody was tasked to 'destroy' the receivers. They need gauging, there is a good chance that there is something wrong with them. 

If they appear to be in good condition, it would piss me off too. I have a couple of full length long Lee barrels which have very good bores but have been 'surplussed' by whacking them half way down their length with a FBH to dent them into the bore.  
I bought them for take off parts for sights and have them squirreled away in the rack for when I have enough junk parts one day to build a full length DP .


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Look to your front, mark your target when it comes!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Canuck Quote  Post ReplyReply Direct Link To This Post Posted: October 23 2018 at 2:57pm
Englishman_ca, I will take those points you made into careful consideration. Thanks for your always informative advice, sir!
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