Kevin Muramatsu - Gun Digest American Arms ATI GSG-5 Assembly/Disassembly Instructions

Similar/Identical Pattern Guns

The same basic assembly/disassembly steps for the GSG-5 also apply to the following guns:

GSG-5 SD
GSG-522

Many heads were turned when American Tactical Imports began importing the German Sport Guns GSG-5 in 2009. It has since branched out into several different configurations and even pistol variants. The main selling point, of course, is its striking visual similarity to the HK MP-5 submachinegun. In fact, ATI was the object of litigation because of this, which forced a temporary halt in sales, and a significant redesign. It is a relatively heavy gun (for a 22) and, as a result, closely duplicates the feel and look of an MP-5. A brief note: the original SD models barrel shroud was recalled due to legal issues in relation to the National Firearms Act and any of these rifles serviced should be checked to verify that it has the replacement barrel shroud.

With the action closed and the gun decocked, remove the buttstock screw. Push the buttstock bolt out the opposite direction. The bolt head is slightly splined.

Remove the trigger housing screw from behind the magazine well. Push the trigger housing bolt out the opposite direction. Like the buttstock bolt, the head of the trigger housing bolt is splined.

Pull the buttstock off to the rear.

Remove this hex screw and its lock washer to take out the bolt stop.

With the action upside down, use a punch to lift the bolt stop out of its slot in the rear of the receiver.

Pull the pistol grip unit back about 1 inch.

Lift the pistol grip off of the receiver.

Pull the breech housing out to the rear of the receiver.

Remove the screw from the forend front and push the front forend bolt out the opposite direction.

Remove the forend by pulling down on the front and then pulling it off.

Unscrew the barrel shroud and remove it from the barrel.

Remove the rear sight by taking out this screw. There is a star washer beneath it that tensions the sight. Be careful not to lose it. The windage adjustment screw lies just beneath the right side of the rear sight assembly. It can be unscrewed if necessary.

Lock the charging handle back to the rear and unscrew the handle retaining screw through the hole in the right side of the tube to release the charging handle from the cocking bar.

Remove the screw in the center of the magazine catch button on the right side of the receiver and push the magazine catch out to the left. Removing the bolt catch spring at this time would be wise. Gently pry it out with a small screwdriver through the ejection port.

There are six screws that now need to be removed: these four, one behind the magazine catch and one behind the rear sight. This particular screw is shorter than the rest and acts as a tension pin for the charging handle tube, while the others hold the receiver halves together.

While firmly holding the two receiver pieces together, grasp the front sight and pull the front sight and charging handle tube forward about 3/8ths of an inch until it stops against the step on the barrel.

Holding the right side down, lift the left side of the receiver straight up. At this point, virtually everything remaining in the receiver is loose. The bolt catch spring will fall out if it has not already been removed.

Remove the bolt stop.

Remove the center plate at the top of the receiver.

Remove the magazine catch, first the top half (the button and spring) then the bottom half (latch).

The guide rod and charging handle spring can be lifted up and pulled straight back and out.