Raygis LasVegas

Custom barrel hack by 8cm. The outer barrel is now the same length as the inner barrel.

- Lining up by the pistol grips. Contact info: Tang_Raymond@yahoo.com Gun Doctor Services: $45 for mechbox upgrades. Repair costs may vary.

- Lining up by the pistol grips

- Pry open the back of the gearbox. - Insert a screwdriver and secure the spring guide. - Slowly open the mechbox halves. Your left hand should be keeping the spring guide and piston assembly stationary. Your right hand should be opening the mechbox shell. Without my left index finger, the piston assembly (piston, cylinder, cylinder head, tappet plate) would fly to the right and possibly breaking something in the process. - The gears used are XYT brand. These are commonly found in Cyma AEGs. - Not that to diss Cyma and Star, but if those gears are found in cheap p

- Place the selector switch between semi and full-auto. - Wiggle the mechbox upwards and away from the lower receiver. - Gearbox removed from lower received. Disassembly & Inspection of the Gearbox - Star used a shrink wrap to secure the motor wires to the side of the motor cage. During it's inspection, I cut away at the shrink wrap. - Pictured here is the shrink wrap being taped together by me. - The motor Star used was very whiny. So far with my experience, I prefer Classic Army motors ( CA M4A1, CA249, CA36K, CA36C

Removing the Gearbox - Unscrew the gearbox retaining screw. - Retaining screw removed. - Punch out the large body pin. - Since the pin was externally visible, I did not want to scratch it during removal. For it's protection, I covered it with a layer of electrical tape cut to a circle. - Electrical tape protecting the pin. - Pin ready to be punched out.

- A problem I had with the Star UMP was their outer barrel. Right out of the box, the barrel was loose. That was why I decided to take it down to every last bit. To solve this problem, I pre-drilled a hole where the grub would normally sit when the barrel was tightened. This allows the grub screw to grab onto a recess and not allow the outer barrel to unscrew itself. Stripping the Inner Barrel - Inner barrel assembly - Remove spring - Remove hop-up wheel retaining clip. - Line up protrusions and prepare to slide off hop-up wheel.

- Pin being punched out. - Hop-up centering peice removed. - Removing centering piece. Make sure you reassemble the barrel as per these photos.

- Very long battery storage. Great for custom packs up to 12 cells in series! Stripping the Inner and Outer Barrel - Outer barrel assembly. - Remove the grub screw. - Grub screw removed. - Unscrew the outer barrel from the breech block. The outer barrel has negative threads. Make sure you turn it clockwise to loosen. - Negative threads are show here. - Punch out this pin to remove the "hop-up centering piece".

- Punch and push out the barrel retaining spring pin. - Slide out the barrel from the upper receiver. - Inside the handguard.

- The cocking tube hole located above the barrel allows the user to push out the battery. - The flashider can be removed by rotating it clockwise. - The Star UMP features a true free floating barrel. - To remove the barrel you must punch out the barrel retaining pin. You should use a proper spring pin punch instead of an allen key. I was too lazy to find the proper tools.

- Press the button to release the folding stock. - Here you can see the shimming job I did to have the stock fit snuggly when locked. - Pull the trap door down and then swing it downwards. - I used a 9.6V 1200mah NiMH battery by Intellect. The battery pack consists of 8 cells. The gun can actually fit 12 cells in series. Because of this extra space, the battery has room to move back and forth. Shim the battery with electrical tape increases it's diameter and makes a snug fit when the battery is pushed in. If the battery is pushed in too much, you can

- Detail shot of the 'bolt'

- Star UMP field stripped. Removing the Inner Barrel - Upper receiver. - Underside of the upper receiver. - Push in the inner barrel assembly. - Rotate the assembly counter clockwise. - The assembly will then spring out with a audible 'click'. Gutting the Upper Receiver

- Push out lower receiver retaining pin. - Rotate the lower receiver from the upper. - Watch out for the wires if you have a battery connected already. Don't over stretch them. - Lower receiver pivoting hook. - This hook is very sturdy. However, I view it as the most delicate part on the UMP. When disassembling and assembling, you should take caution not to twist and break this area.

- Top weaver rail. - The two fixing points keeps the rail stationary. - Top weaver rail. - Here's a minor defect that I found in Star's moulding. Overall, the gun's construction was very well made without many burrs. Seam lines were present though. - Markings on the UMP .45 magazine. Field Stripping - First remove the magazine. - Unscrew lower receiver retaining screw.

- Motor plate. The middle hole adjusts the motor height. - Mag well and lower rail - Plastic front sight and front sight jacket. I believe these parts are metal on the Marui G36C. - Rear sight. - Pictured here is the ghost ring sight being used. This has two settings... ghost ring and open cut. - The rear sight jacket is made from plastic. - Open cut CQB sight used. - Open cut sight. - Ghost ring sight. - Sights aligned. - Rear sight windage adjustment screw. - Rear sight elevation adjus

- The stock features a very nice cheek and recoil pad. These are made from rubber and actually functions preventing slips when shouldered. I like these a lot better than G&P's recoil pad found in there G36 battery folding stock. - The plastic on the stock is very rigid and doesn't have any flex at all. This stock is much better than the Classic Army G36 folding stock. - The seam line down the middle is very minimal. There is no way this stock can split apart even when attempted to flex upon. - The stock retaining loop is a metal loop jacketed by polymer. - Her

H&K UMP .45 cal Guide and Review by Raygis LasVegas Gun Name: Star UMP Version 2 Gear Box - Version 3 Magazine - 110 Rounds Length - 680 Barrel Length - 195mm Weight - 2630g So far, here are some information regarding the different versions available: Version 1: No body pins, fixed cocking handle, incorrect spelling on H&K trademarks. Version 2: Body pins used, fixed cocking handle, blank trademarks. Version 3: Body pins used, movable cocking handle, Correct H&K trademarks. External Inspection - Right side of handguard. - Very strong polymers used for the

I figured some of you guys across the pond might find this handy. Click on the link below for the good stuff! Star UMP - Guide & Review ( 100 pics ) I'll be checking this thread if anyone has any questions regarding the gun or review.

Great job experimenting. However I think you'll need a large cheek rest to make sighting with the scope comfortable and effective.

Wow, you have a nice package!

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Can you post a picture of this G36 with the stock retracted full and the bipod removed?

A stock CA36 will strip it's piston if a high quality 9.6V battery is used. You should at least upgrade to a 370fps spring before using a 9.6V battery.