This is the AAP-01 build people notice on the field: long barrel, flat trajectory, and hits that land where you pointed. The Stalker AAP-001 Upgrade Kit bundles the full 200 mm barrel upgrade into one set, so you get every part you need for a proper long-barrel carbine build in a single order.

What's included

• "Morpheus" Dual Bore AAP-01 Barrel 200MM – 6.05 mm SUS304 seamless stainless steel with a dual bore tapered end crown and an enlarged, unbridged window, built for extra range and accuracy.
• SR Hop Bucking 60° (Purple) – a hybrid between an R-hop and a bucking, with an extended patch for maximum lift and a flat BB flight path.
• AAP-01 TDC + Prowler Hop Plate – replaces the stock hopup parts so you can dial the hop in from the top with a hex key, straight from top dead centre.
• AAP-01 TDC Hole Tool – puts the hole in your upper in exactly the right spot for the TDC kit.
• AAP-01 Ultimate Spring Set (8 springs) – four recoil springs and four nozzle return springs to tune the gun to your gas, mags and local temperatures.
• AAP-01 Marine Grade Stainless Steel Screw Set – A4 stainless screws for the upper receiver and internals, two of them with thread lock.

Why buy it as a bundle

A 200 mm barrel only pays off when the rest keeps up. The Morpheus barrel and SR Hop bucking give you the reach, the TDC kit lets you fine-tune that hop instead of guessing, the spring set keeps the cycle consistent with a longer setup, and the stainless screws make sure nothing rattles loose after a full day of skirmishing. One order, one afternoon of wrenching.

Good to know

• Made for the Action Army AAP-01. The 200 mm barrel suits carbine and SMG-style builds with an extended outer barrel.
• The TDC kit requires a 2 mm hole in your upper. The included tool makes it foolproof, but if you'd rather not drill, hand it to your local tech.
• Always check your joule output after installation before you take it to the field.