Zev wedge lock rail

[Hammer_Man]

If you’re starting a new build from scratch the locating pin is not a problem, as you can buy an upper receiver from the following:

Zev
https://www.zevtechnologies.com/forged_upper_ar15

Mega
https://www.zevtechnologies.com/mega...upper-receiver

SOLGW
https://www.primaryarms.com/solgw-st...upper-receiver

Icon Defense
https://www.icondefense.com/product/...iver-stripped/

Rainier Arms
https://www.rainierarms.com/rainier-...receiver-gen2/

Expo Arms
https://www.primaryarms.com/expo-arm...upper-receiver

Hodge Defense
https://www.bigtexordnance.com/produ...aluminum-black

And if you can find one, a Noveske forged upper.