Which is preferable? I'm thinking inch, as I think I recall inch can take both mags, but metric is metric only. Or is swapping a bad idea either way?
Looking at a couple kits, first trying to find out country of origin on kit, company and country, and same on receiver. Guys just lost interest, and wants to sell off his parts.
Anything to avoid on either?
Im trying to search this, but plugging in "inch metric" is yielding a LOT of results!