Colt front takedown pin? lolwut?

sithinside

sithinside

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So, ordered a Colt LPK from Brownells a while ago, and it showed up yesterday. Inspecting it and found something funny with the front takedown pin. I'm not overly versed in the way of oldschool Colt stuff, so maybe someone can tell me if this is normal and/or if I put it on my carbine my wiener won't fall off? Looks to me like this would be a minor annoyance compared to the regular takedown with the detent, is the general consensus that this oldschool Colt system is stupid?

Colt front takedown with the screw on the top, Bushmaster standard front takedown with the detent section milled out
colt_takedown_02_zpse61fedd0.jpg


Another picture of the takedown with the screw started
colt_takedown_01_zpse68a282c.jpg
 
This is from the older "green label" as they are known colts. It should also be a slightly larger pin thought I could be wrong and they made normal size as well. Yes a huge pain in the ass.
 
My large-hole Colt Sporter had that stupid screw-in front pin. It didn't have a recess in the lower for a pin detent, so the screw-in pin was required. It was a real PITA when cleaning, but causes no problems during use.
 
sithinside said:
It's the same size, fits in just fine in my stripped lower with no wiggle. Is it worth the pain in the ass? Will it make me shoot 2-3MOA better? :D
Click to expand...

If it is the same size, then it can be used just fine if you wish. No effect either way on accuracy. These screw retained front pins were originally a larger size so as not to fit anything else but a Colt commercial model from those earlier years.
 
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Ya, we'll see if I used it or not, I don't think it's really needed, but I was hoping to have more Colt parts on my AR for my own piece of mind than anything else.
 
The screw and collet you have is from mid life production Sporter that used M16 style upper receivers with the .250 in holes. These were the "slab side" receivers with no boss for the take down pin detent spring so a screw on the left was used to retain it.

They were changed to .250 to streamline production and increase interchangeability.

Earlier models of the SP1 through the AR15A2 series used a .315 screw and collet.

Later models of the Sporter and Match Target used the mil-spec .250 captive pin with detent in the receiver.

There is an offset screw adapter to fit .250 hole uppers to the older .350 lowers. Brownell's used to sell it IIRC.

The approvals to make a semi-auto only version originally came from the Treasury department in 1963. Colt provided a proposal to prevent "re-conversion" to FA.

The upper receiver has a cutout to allow clearance for the the auto-sear. There were ten original changes required to get the approval. One was a semi-auto only upper with no clearance cut and a means to prevent swapping the uppers.

All of the other changes or the years to the AR-15s were as a result of changing laws or various lawsuits - like the auto sear block lowers for example.
 
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I generally use the Colt LPKS from Brownells since they don't include triggers. I typically use aftermarket triggers anyways ...it just seems less wastefull ( despite the higher cost of the Colt LPK ! )


Since that LPK doesn't come with the pivot pin detent I figure its easier to just buy the KNS pivot pins . Nothing wrong with using the Colt pivot if you are not swapping uppers often
 
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