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View thread Contact supportThe first three builds I did, 10-15 years ago were on spikes because they were all that were available to me at the time (Kalifornia), zero complaints then or since, no issues ever. I wish they didn't have their funky graphics on the lowers personally but functionally I haven't found an issue.The last three lowers I have built were Spikes, 17 Designs (now defunct) and Aero Precision. I am always open to suggestions.
Expo is Zev is Mega.Most of mine are Mega, Tumwater marked. Since I can no longer get those, Expo Arms as the anodizing matches great.
The original Megas are Tumwater marked. Anything after that is Zev and the anodizing doesn't match the original Mega uppers. The Expos are the closest I've seen so far.Expo is Zev is Mega.
I've used Aero, Anderson, PSA, LMT, and others.PSA. Too cheap? Aero - the fanciest I have.