If we made as many 7.62x39mm rifles as we do 5.56, the price would be about the same. You guys on this forum are right, the R&D costs are higher. The 7.62x39mm varies much more than the 5.56 does. We had to do a lot more testing with a lot of ammo.
The 7.62x39mm ammo is cheap now but may go up a lot. For this reason, we may look at a .22LR conversion. On the other hand, We've had a few people want other .458 SOCOM and other weird calibers.
The 7.62x39mm does kick more than the 6.8 or 6.5. Our brake really helps a lot.
The advantage of our rifle over an AK or something cheaper is the accuracy. This darn XCR shoots tight groups using good 7.62x39mm ammo. I'm talking MOA or very close thereto.
BTW, the .300-221 didn't fly so well.
Also, if there's a moderator around these parts, he or she should put these posts under the 7.62x39mm thread.
Alex J. Robinson