How well does the lower work (especially in Auto mode) with:
- 9mm upper and Stern Defense mag adapter
- 300 blk upper
- 7.62x39 upper and mags (I am reading very mixed reviews on the mags)
- .22 conversions and mags
What have you used that worked and didn’t work?
Thanks
- 9mm upper and Stern Defense mag adapter
- 300 blk upper
- 7.62x39 upper and mags (I am reading very mixed reviews on the mags)
- .22 conversions and mags
What have you used that worked and didn’t work?
Thanks