KelTec R50 with A3 aluminum machined folding stock. Also has the magazine guide for fast reloads. Takes 50rd FN P90 magazines. 5.7x28mm. I have all original parts and box. Very interesting firearm. Excellent for zombie eradication or time travel. Comes with two 50rd magazines. Very lightweight and fun to shoot. Red dot sight not included. Less than 50rds fired through it.