Quoted: okay great, i saw approximately the same prices you quoted on gunbroker .com. however i did not know the sp1 upper will only fit the sp1 lower, is it because of the size of the pivot pin?
snipen
oh, and thanks!
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Yes, unless you purchase an adapter sleeve, to reduce the upper front pin diameter, it will only fit the SP1 lowers.
A bit of personal advice, for whatever it's worth. The ONLY sales site I have found with the best prices on AR parts is right here in the EE section og this site. If I'm looking for something for an AR, it's the only place I look. And of what you're after isn't there today, just check back a couple of times a day for awhile, and it'll turn up
If yo're wanting an early type top end, to fit on a later model lower, keep an eye out for a milsurp M16 or M16A1 unit. They show up over on the RR section at least a couple of times a week. The M16 units are Air Force surp, and the A1 types are Army surp.