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Posted: 1/5/2003 4:21:16 AM EDT
I've got a Colt preban AR15.  The rear takedown pin is of "pushpin design".  No problems there.

The front takedown pin requires TWO screw drivers to tighten and seems to be offset.  Rotating the pin tightens-or loosens the upper reciever.  What is wrong with using the same design for both?  

This does not seem like such a good idea.  It is as though someone put a lot of time and energy into making something so simple, so damn complicated.  I'm sure I am missing something so somebody please fill me in.

Link Posted: 1/5/2003 4:38:12 AM EDT
This is normal, you should be able to have it smithed and a push pin installed.
Link Posted: 1/5/2003 6:40:26 AM EDT
[Last Edit: 1/5/2003 6:41:54 AM EDT by DarkStar]
Colt spent a great deal of time doing things like this in an apparent attempt to make the rifle 'less' military... or more proprietary... take your pick.

Options are available to change out the double screw setup...


edited for link
Link Posted: 1/5/2003 10:43:21 AM EDT
Link Posted: 1/5/2003 3:54:30 PM EDT
[Last Edit: 1/7/2003 8:54:24 PM EDT by gman552]
Check out this link to DPMS's accessory pins page:


They have the steel quick-takedown pins for the large hole (.312") uppers/lowers, and for the small hole (standard mil-spec .250") uppers/lowers.

There are also offset screws/nuts to connect large-hole assemblies to small-hole assemblies.


[Edited because "quick-takedown pins" are not the same as "pushpins."]
Link Posted: 1/5/2003 9:02:03 PM EDT

Does the dpms quick-take down pin you mentioned require any gunsmithing to fit/work?
Link Posted: 1/6/2003 6:53:28 PM EDT
The quick-take down pins do not require gunsmithing, they just replace the pivot screws at the front of the lower.  They are not captive, thus you can push them out completely from left to right.

The "pushpins" on the other hand, have a groove along the length of the pin, into which a detent under spring pressure fits.  These pushpins are captive, and will not fall out the other side.

As Troy mentioned, the pushpins require a lower receiver which 1) has a "fence" around the mag release, and 2) is drilled for the detent.

Link Posted: 1/7/2003 3:45:00 AM EDT
Troy --

Not even the XM16 had a "two screw" pivot pin, the M16 certainly never had one.  Some very early military AR15 rifles (the select fire models) may have had 'em, but it's been 40 years.

-- Chuck

Link Posted: 1/7/2003 4:59:39 PM EDT
Who would anyone suggest to do the drilling for the push pin? I just bought a HBAR to convert my post M4 to pre M4 and I want it captive like my current receiver.

Link Posted: 1/7/2003 8:52:21 PM EDT
[Last Edit: 1/7/2003 8:52:43 PM EDT by gman552]
I think Kurt's Kustom Firearms (KKF) would be a good place to have this done:


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