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  #1  
Old 02-17-2020, 03:53 PM
kpaintner kpaintner is offline
 
Join Date: Sep 2010
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Default Polytech in a USGI stock

Can anyone tell me if a Polytech will “drop in” to a USGI stock. Thinking about doing that, but I do not want to have to do a bunch of mods to a USGI stock to make it work.

Thanks,
Kevin
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  #2  
Old 02-17-2020, 04:00 PM
wd0bc wd0bc is offline
 
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Default Poly in usgi stock

Yes...nicely
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  #3  
Old 02-17-2020, 04:05 PM
nf1e nf1e is online now
 
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Yes it will. Polys and Norinco are usually closer to usgi spec than most of the commercial reproductions available.
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  #4  
Old 02-17-2020, 04:13 PM
TLB TLB is offline
 
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Drop in, but sometimes the trigger (?) pin can walk out on firing. Replacing with USGI pin or gluing in a spacer are both easy fixes if the problem shows up.
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  #5  
Old 02-17-2020, 04:15 PM
kpaintner kpaintner is offline
 
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Ok...thanks everone.
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  #6  
Old 02-17-2020, 06:26 PM
oodnoodn oodnoodn is offline
 
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It's not the trigger pin, but a Polytech connector lock pin is a bit shorter than an M1A equivalent, & in a USGI stock it will walk out far enough to release the oprod spring guide. This can make the magazine hard, or wierd, to remove & the oprod spring guide will be pushed back into the magazine well under oprod spring pressure. It doesn't break anything, it just turns your semiauto into a single shot or club until you get things latched back into place.


The poly (or Norinco) stock has a little more wood in the critical place to keep the connector lock from walking out. The simple solution to use a USGI stock is the popsicle stick mod; glue a small piece of popsicle stick (just the right width) into the stock to hold the connector lock in place.


Or replace the connector lock with a longer (USGI or SAI) one.
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  #7  
Old 02-20-2020, 10:56 AM
kpaintner kpaintner is offline
 
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Thanks again...for the tips!
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  #8  
Old 04-01-2020, 07:10 PM
mikebaker1129 mikebaker1129 is offline
 
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Location: Houston ,TX
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Quote:
Originally Posted by oodnoodn View Post
It's not the trigger pin, but a Polytech connector lock pin is a bit shorter than an M1A equivalent, & in a USGI stock it will walk out far enough to release the oprod spring guide. This can make the magazine hard, or wierd, to remove & the oprod spring guide will be pushed back into the magazine well under oprod spring pressure. It doesn't break anything, it just turns your semiauto into a single shot or club until you get things latched back into place.


The poly (or Norinco) stock has a little more wood in the critical place to keep the connector lock from walking out. The simple solution to use a USGI stock is the popsicle stick mod; glue a small piece of popsicle stick (just the right width) into the stock to hold the connector lock in place.


Or replace the connector lock with a longer (USGI or SAI) one.
Not so simple of a mod, you will need to turn the USGI pin down to Chinese spec or machine the receiver to accept a USGI connector lock.
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  #9  
Old 04-08-2020, 07:52 AM
Sailormilan2 Sailormilan2 is offline
 
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You can either glue a piece of a popsicle stick on the inside of the stock, or place a small dab of thickened epoxy there to prevent the pin from walking out. Make sure that there is release agent on the receiver and the pin at that location, put the epoxy blob on the stock, and insert the action into the stock.
I've done both.
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  #10  
Old 04-08-2020, 07:39 PM
Deuceguy Deuceguy is offline
 
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Location: Northfield, OH
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Get a GI connector lock and see if it fits. If the connector lock's OD is too big, chuck it up in a drill and spin it in some sand paper. Then cold blue it.
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