A Real SP1 Clone

[ClassIIIGunsmith]

So I'm working on building a exact clone (excluding Serial#) of my 1976 SP1; which means I need a lower with the .315" diameter front pivot screw hole. Does anyone make any that's not as expensive as a real SP1 lower. The reason I'm asking is because I already have the complete large pin upper.

[danieljmaunder]

Nodak Spud just began selling Retro 80% lowers. I'd start there.

[ClassIIIGunsmith]

Nope the area would be too small by about .065 and thats a lot of metal being lost for structural strength.

[Renegade04]

You can use one of these...
http://www.brownells.com/.aspx/pid=24949/Product/AR_15_M16_PIVOT_PIN_ADAPTER_BUSHING

and one of these.
http://www.knsprecisioninc.com/gun-parts-and-accessories/pivot-takedown-pins/replacement-pivot-pin-250-dia.html

These are what I used to adapt a SP1 large hole upper to Nodak Spud slabside small hole lower.

http://i100.photobucket.com/albums/m8/jamesrea_2006/Weapons%202013/002_zps2782d170.jpg (http://s100.photobucket.com/user/jamesrea_2006/media/Weapons%202013/002_zps2782d170.jpg.html)

http://i100.photobucket.com/albums/m8/jamesrea_2006/Weapons%202013/001_zps0279681d.jpg (http://s100.photobucket.com/user/jamesrea_2006/media/Weapons%202013/001_zps0279681d.jpg.html)

http://i100.photobucket.com/albums/m8/jamesrea_2006/Weapons%202013/008_zps891079f6.jpg (http://s100.photobucket.com/user/jamesrea_2006/media/Weapons%202013/008_zps891079f6.jpg.html)