Ar9 upper to go with spikes ar9 lower?

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Ar9 upper to go with spikes ar9 lower?


Post by Killadocg23 » Tue Aug 27, 2019 9:36 pm

Gonna pick up a spikes 9mm lower here shortly. Curious as to if any one has built an AR9. What uppers fit the spikes . I know some can be finicky even though they all are supposed to be mil spec.

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Re: Ar9 upper to go with spikes ar9 lower?


Post by The Annoyed Man » Thu Aug 29, 2019 8:50 am

I’m not certain that there is a mil-spec for 9mm lowers. I do have a "multi-caliber" Spikes Gen II Billet lower, and it will fit all of my uppers, including 2 from BCM, and 4 others I built myself—including 2 that use the matching Spikes Gen II Billet upper.

So my guess is that pretty much any 9mm upper will fit your 9mm Spikes lower. I think the bigger issues are probably things like proper selection of the BCG and other moving parts.
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