I have a San Tan build, it's nice but a bit heavy duty. The ambi controls are also nice but a bit bulky and proprietary so hope they don't break. There are some fiddly bits in the upper receiver to "tune" the fit which I did not need to use. Radian has San Tan or the same company do their receivers too as they appear identical.
If I had to do it over again, I'd probably pick up a PWS ambi receiver set with the Lightweight upper.
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