Most Compact TAC 41 Variant Sports Series of the TAC 41 Line-up High-Impact Polymer Main Upper Receiver Construction High Picatinny Rail for Mask Users Tapered Aluminum Outer Barrel (330mm, 6.05 Brass AEG Type) Quick Change Barrel (Bayonet Lock + Clamp Receiver Design) M24x1 Threaded Outer Barrel (Compatible with any M24x1 Muzzle Device) 1 Barrel Spacer Fiberglass Reinforced Nylon Lower Body Construction Picatinny Stock Attachment Easy Hop-Up Adjustment 48 Round Capacity Steel Magazine Catch (AK Style) Stainless Steel 41 CC Cylinder/Bolt Assembly Stainless Steel Spring Guide with Thrust Bearing APS 13mm Spring Compatible, 90N Stock Spring Pre-Installed with Additional 120N Spring Included Quick Change Bolt System Stainless Steel Trigger Group (Sear, Spring Guide Stopper, Trigger Box, Safety Switch) Pre-Load Adjustable with Adjustable Two-Stage Setting Polycarbonate Body Adjustable Hop-Up Chamber (TDC Design) AEG Hop-Up Rubber Compatible Anti-Double Feed System Comes with Lite Chassis and Recon Stock