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228 Posts
When my tsd sd700 vsr10 imitation (same gun as well mb03) is cocked, the bolt will not slide all the way forward. Instead, it will still have a couple milimeter to go, causing the cylinder head to not go far enough into the hopup bucking. The gun still shoots, but there is a major compression loss because of the air leak between cylinder head and bucking, and the bb's don't go nearly as far as normal.
Important info:
-When the trigger box is allowed to slide forward (screw removed) the bolt goes forward fine, even when cocked. This is because the trigger box moves forward a bit as the bolt goes forward, and the problem is solved. When the screw is back in place, and the trigger box is secure, the bolt problem persists. I cannot leave the screw out or the spring guide stopper will become loose, causing slam-fire.
-Bolt moves forward fine when gun is uncocked.
-I just got a new trigger box to fix the problem, but it did not help. Problem is unlikely to be with the trigger box itself.
-Everything looks aligned and working perfectly, which is why I'm completely stumped.
-Problem has nothing to do with outer barrel/hopup unit, as I am testing with only the bolt, trigger box, and reciever/bolt holder.
-Problem does not have to do with the piston O-ring or part #60 in the diagram below, because the problem has persisted when those objects were removed.
-Everything in the cylinder looks fine to me.
Diagram:
http://www.airsplat.com/Manuals/AR-HA-231-VSR10-13.jpg
Basic Bolt Operation:
http://www.google.com/imgres?start=...=166&tbnw=206&ndsp=12&ved=1t:429,r:1,s:91,i:7
Pics of the problem:
Bolt in correct forward position (uncocked):
img189.imageshack.us/img189/504/goodyy.jpg
Bolt cocked, cannot go fully into forward position:
img714.imageshack.us/img714/1724/badnc.jpg
I'm completely stumped, and simply cannot find anything wrong, even though the symptoms show the problem as obviously a problem with the relation of the trigger box to the bolt. Any help will be appreciated. Thanks.
Wow!!! My new cylinder kit (piston, spring guide, spring) just arrived and it did nothing to help my problem. I've got a new trigger box and a new cylinder kit, yet the bolt still doesn't go all the way forward when the gun is cocked! Therefore I can conclude that the problem is NOT caused by my slightly bent piston. The good news is that my new cylinder internals are made out of STEEL instead of some polycarbonate.
NEW EDIT: Major Breakthrough in progress! I found out that the bolt could only move forward all the way when the gun is uncocked BECAUSE THE SPRING GUIDE STOPPER COULD WIGGLE FORWARD. When the gun is cocked, the spring guide stopper is prevented from moving forward (because the piston sear catches the piston) and the bolt cannot go all the way forward. It's really just the last mm or so, but that makes a huge difference!
Important info:
-When the trigger box is allowed to slide forward (screw removed) the bolt goes forward fine, even when cocked. This is because the trigger box moves forward a bit as the bolt goes forward, and the problem is solved. When the screw is back in place, and the trigger box is secure, the bolt problem persists. I cannot leave the screw out or the spring guide stopper will become loose, causing slam-fire.
-Bolt moves forward fine when gun is uncocked.
-I just got a new trigger box to fix the problem, but it did not help. Problem is unlikely to be with the trigger box itself.
-Everything looks aligned and working perfectly, which is why I'm completely stumped.
-Problem has nothing to do with outer barrel/hopup unit, as I am testing with only the bolt, trigger box, and reciever/bolt holder.
-Problem does not have to do with the piston O-ring or part #60 in the diagram below, because the problem has persisted when those objects were removed.
-Everything in the cylinder looks fine to me.
Diagram:
http://www.airsplat.com/Manuals/AR-HA-231-VSR10-13.jpg
Basic Bolt Operation:
http://www.google.com/imgres?start=...=166&tbnw=206&ndsp=12&ved=1t:429,r:1,s:91,i:7
Pics of the problem:
Bolt in correct forward position (uncocked):
img189.imageshack.us/img189/504/goodyy.jpg
Bolt cocked, cannot go fully into forward position:
img714.imageshack.us/img714/1724/badnc.jpg
I'm completely stumped, and simply cannot find anything wrong, even though the symptoms show the problem as obviously a problem with the relation of the trigger box to the bolt. Any help will be appreciated. Thanks.
Wow!!! My new cylinder kit (piston, spring guide, spring) just arrived and it did nothing to help my problem. I've got a new trigger box and a new cylinder kit, yet the bolt still doesn't go all the way forward when the gun is cocked! Therefore I can conclude that the problem is NOT caused by my slightly bent piston. The good news is that my new cylinder internals are made out of STEEL instead of some polycarbonate.
NEW EDIT: Major Breakthrough in progress! I found out that the bolt could only move forward all the way when the gun is uncocked BECAUSE THE SPRING GUIDE STOPPER COULD WIGGLE FORWARD. When the gun is cocked, the spring guide stopper is prevented from moving forward (because the piston sear catches the piston) and the bolt cannot go all the way forward. It's really just the last mm or so, but that makes a huge difference!