This is the 160mm version with power up inner barrel. 14mm Negative threading I believe. Very popular and well reviewed on Evike! Retails for $65 and is currently sold out and available for pre-order in 2022. GET YOURS NOW! Never fielded, only put on and shot in the backyard. Gave me about a 22fps jump on my Krytac Trident PDW! Only selling because I run an tracer now!