Arex Delta vs COP .357 Derringer

2017–present

1983–Present

Unknown

~150,000 estimated

180 mm

140 mm (5.5 in)

102 mm

63 mm (2.5 in)

640 g (unloaded)

0.5 kg (1.1 lb) empty

15+1 or 17+1 rounds

4 rounds (integral barrel cluster)

short recoil

Double‑action only; four independent hammers cocked sequentially by a single trigger pull

striker-fired

Heavy double‑action trigger with a long pull, no single‑action mode

3-dot or optics-ready

None; optional low‑profile notch milled into the top of the frame for limited aiming