80% jig question

[jvpark]

Are all jigs universal? I know there Is probably a difference between a Billet and forged Jig but was not sure if there are any other differences?

[jfifer]

I really doubt it. In the end, an in spec receiver is an in spec receiver.

[Cali Mike]

If the jig is clamping on the 7/8 (.875) thick area, then yes they are all the same.
The takedown pins distance are all the same.
The distance from the takedown pins to the top of the receiver are all the same.
The takedown pin diameters are all the same (.251)


BUT other than those areas, ever different lower is drastically different. From forged to forged, machined to machined, and machined to forged.

You may get lucky, and find a jig from one manufacture that fits another, but that's a rarity.

[vw69turbobug]

just like cali said all a jig does is help you hold your 80 in a vice. and help out with a few holes.... but yes i have used different 80% on my cncguns jig on 3 different lower and didnt have any problems.

[donmopar]

Most jigs were designed for forgings and have clearance problems with some billets that have different style mag wells. Most of them will fit with a little modification.

[goober]

Most jigs were designed for forgings and have clearance problems with some billets that have different style mag wells. Most of them will fit with a little modification.

^THIS
i own 3 different popular jigs and have finished 80% paperweights from from at least 5 or 6 different vendors.
the only issues i have had fitting a lower into any jig have been w/ billet designs that do not have standard dims (ie. magwell flares, non-standard ribs, etc.)