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Posted: 1/5/2003 4:38:12 AM EDT
[#1]
This is normal, you should be able to have it smithed and a push pin installed.
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Posted: 1/5/2003 6:40:26 AM EDT
[#2]
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... [url]www.bushmaster.com/shopping/lowers/oak-01.asp[/url] edited for link |
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Posted: 1/5/2003 10:43:21 AM EDT
[#3]
Quoted: This is normal, you should be able to have it smithed and a push pin installed. Those early SP1s were built on original M16 raw forgings, so they don't have the raised fence around the mag release button or a channel for a pivot pin detent. Most people call these "slabside" lowers. The original M16s had pivot screws also. The M16A1 had the fence and pushpins, so Colt used up all of the extra M16 forgings to make SP1s. However, they changed the size and center point of the pivot hole on the SP1s to make it more difficult to mount standard military uppers. Anyway, these uppers require an adapter to mount standard uppers, and there's not much way around it. Later Colt pre-bans eventually got the raised fence (once the old M16 forgings ran out), and these can be modified for pushpins. -Troy |
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Posted: 1/5/2003 3:54:30 PM EDT
[#4]
Check out this link to DPMS's accessory pins page:
[url]http://www.shooterstore.com/acb/showprod.cfm?&DID=90&CATID=494&ObjectGroup_ID=1369[/url] 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. HTH, Gabe [Edited because "quick-takedown pins" are not the same as "pushpins."] |
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Posted: 1/5/2003 9:02:03 PM EDT
[#5]
gman552,
Does the dpms quick-take down pin you mentioned require any gunsmithing to fit/work? |
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Posted: 1/6/2003 6:53:28 PM EDT
[#6]
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. HTH, Gabe |
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Posted: 1/7/2003 3:45:00 AM EDT
[#7]
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 |
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Posted: 1/7/2003 4:59:39 PM EDT
[#8]
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.
[?] |
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Posted: 1/7/2003 8:52:21 PM EDT
[#9]
I think Kurt's Kustom Firearms (KKF) would be a good place to have this done:
[url]http://www.kurtskustomfirearms.citymax.com/page/page/8932.htm[/url] Gabe |
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