Glock 17 gen 5, curing belt fed problem.
Apr 7, 2023 19:49:59 GMT
HeadHunter, Modski66, and 6 more like this
Post by flatrajectory on Apr 7, 2023 19:49:59 GMT
So gentlemen, this is a technical tip/how to fix a common issue with the new breed of replicas coming in with chain/belt fed pellet magazines. So, this gen5 Glock came into my possession recently and these are my initial findings..
keyboard checker tool
The pistol has the usual Umarex quality feel about it, nicely finished, no rattles or wobbly bits.
The trigger pull , without a magazine inserted is light and crisp. With a magazine in however it`s a whole different story.
Notchy and very stiff, similar to the Chiappa Rhino in s/a mode, but more notchy. Trying to get groups at 6 yards requires very intense concentration, but still does not deliver. At least all shots are on the paper.
Now , I thought why should this be so bad, so set about finding the cause.
You can tell you are in for a rough ride just trying to load the 21 pellets into the chain mag. You load them 2 at a time then rotate the belt by hand to the next 2 empty chambers.... just trying to rotate the belt is stiff, and you know right away that pulling the trigger to rotate the chain is going to be bad.!!
So. magazine out and remove the front, curved alloy plate ( 2 screws one top , one bottom. Note. The lower one is longer ).
The belt runs around 2 sprockets, just like a bicycle chain. The upper sprocket is a Christmas tree shaped part and is rotated by teeth on the front ,upper face which is activated by a lever in the trigger mechanism. I lifted up the chain and sprockets in one piece and then separated the parts. All parts looked to be well made. I re inserted the sprockets on their pivot pins and tried to turn them manually. The lower, free wheeling cog spun smoothly. The upper ( actuating ) cog however was very notchy. On close inspection I could see the cause of the notchiness.
In the photo I have pointed at the front of the gas valve/firing pin. This was protruding about 1 thou of an inch and was catching each of the protruding lugs at the base of the cog that you can see in this photo.
The cure was to remove the valve and skim a thou of the front face on my belt sander, then refit it, so that its face was now flush with the outside casing.
I refitted the cogs and chain, refitted the front plate, and tried rotating the chain/belt by hand.... Result...smooth as silk.
The shooting experience is now vastly improved, not fantastic, as it is still having to turn that belt full of lead, but I can now get 1 1/2" groups at 6 yards. I think also that the trigger pull will improve with use. So if any of you has a belt fed magazine in your pistol... have a look at this.
Pete.
keyboard checker toolThe pistol has the usual Umarex quality feel about it, nicely finished, no rattles or wobbly bits.
The trigger pull , without a magazine inserted is light and crisp. With a magazine in however it`s a whole different story.
Notchy and very stiff, similar to the Chiappa Rhino in s/a mode, but more notchy. Trying to get groups at 6 yards requires very intense concentration, but still does not deliver. At least all shots are on the paper.
Now , I thought why should this be so bad, so set about finding the cause.
You can tell you are in for a rough ride just trying to load the 21 pellets into the chain mag. You load them 2 at a time then rotate the belt by hand to the next 2 empty chambers.... just trying to rotate the belt is stiff, and you know right away that pulling the trigger to rotate the chain is going to be bad.!!
So. magazine out and remove the front, curved alloy plate ( 2 screws one top , one bottom. Note. The lower one is longer ).
The belt runs around 2 sprockets, just like a bicycle chain. The upper sprocket is a Christmas tree shaped part and is rotated by teeth on the front ,upper face which is activated by a lever in the trigger mechanism. I lifted up the chain and sprockets in one piece and then separated the parts. All parts looked to be well made. I re inserted the sprockets on their pivot pins and tried to turn them manually. The lower, free wheeling cog spun smoothly. The upper ( actuating ) cog however was very notchy. On close inspection I could see the cause of the notchiness.
In the photo I have pointed at the front of the gas valve/firing pin. This was protruding about 1 thou of an inch and was catching each of the protruding lugs at the base of the cog that you can see in this photo.
The cure was to remove the valve and skim a thou of the front face on my belt sander, then refit it, so that its face was now flush with the outside casing.
I refitted the cogs and chain, refitted the front plate, and tried rotating the chain/belt by hand.... Result...smooth as silk.
The shooting experience is now vastly improved, not fantastic, as it is still having to turn that belt full of lead, but I can now get 1 1/2" groups at 6 yards. I think also that the trigger pull will improve with use. So if any of you has a belt fed magazine in your pistol... have a look at this.
Pete.
