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Discussion Starter · #1 ·
been researching getting an upper.. and I see a few pales mentioning 'small front pin' Looking at my milspec lower it appears ( have not measured ) that the pis are the same size.. I take it there are some models with a smaller front pin i should be avoiding?

again.. ar newb here..

thanks for any help.
 

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Discussion Starter · #3 ·
after much research.. I guess it was the older colts that had that one larger pin.. and everything else nowadays is small pin front and rear.. ie same size.

cool.. make sit a tad easier.

shocked me when i saw some guys saying small front pin ( and yes.. it was a colt upper.. )
 
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