Airsoft Canada - View Single Post - Looks like TM M14's don't like Sorbo pads

LUTNIT · August 15th, 2008, 02:06

Just a heads up to others who may want to try this.

I have been using Sorbo pads (available at airsoftparts.ca) in my ver.2 and ver.3 guns for a little while now, seems to be working really well. Really made em more quiet. So I wanted the same effect in my TM M14, ver.7 mechbox. I ordered the Sorbo pad set for ver.6/7 mechboxes and installed one. Within 25rnds I had shredded a piston. I opened it up and noticed that the piston was stripped in the opposite direction they normally do, from the piston head end back. I did some thinking and testing and found that the Sorbo pad was almost exactly one piston tooth thick. As a result it offset the piston by one tooth.

What was going on was the first tooth on the sector gear was grabbing the second tooth on the piston (from the back.) As it worked its way up the second last tooth on the sector gear pulled the last piston tooth. The piston tried to go forward but the last tooth on the sector gear smacked it. I guess it took 2-3 shots to snap the first tooth on the piston (the metal one) and now there where 2 extra sector gear teeth hitting the second last piston tooth. Then three against the third last, etc. etc. After around 25 cycles I had broken half the teeth on the piston so it was only really half cycling. All this seems to have been caused by the offset from the Sorbo pad. I have never run into this problem with ver.2 or ver.3 mechboxes (including ICS split mechboxes) but for some reason it cost me a piston in a ver.7.

Just a heads up. Anyone out there know a way to avoid this and still use a Sorbo pad? Currently there is no Sorbo pad and its still damn quiet, also upgraded from the now fragged stock TM piston to a Prometheus hard type.

August 15th, 2008, 02:06	#1
LUTNIT Trader rating Join Date: Dec 2005 Location: Ottawa	Looks like TM M14's don't like Sorbo pads Just a heads up to others who may want to try this. I have been using Sorbo pads (available at airsoftparts.ca) in my ver.2 and ver.3 guns for a little while now, seems to be working really well. Really made em more quiet. So I wanted the same effect in my TM M14, ver.7 mechbox. I ordered the Sorbo pad set for ver.6/7 mechboxes and installed one. Within 25rnds I had shredded a piston. I opened it up and noticed that the piston was stripped in the opposite direction they normally do, from the piston head end back. I did some thinking and testing and found that the Sorbo pad was almost exactly one piston tooth thick. As a result it offset the piston by one tooth. What was going on was the first tooth on the sector gear was grabbing the second tooth on the piston (from the back.) As it worked its way up the second last tooth on the sector gear pulled the last piston tooth. The piston tried to go forward but the last tooth on the sector gear smacked it. I guess it took 2-3 shots to snap the first tooth on the piston (the metal one) and now there where 2 extra sector gear teeth hitting the second last piston tooth. Then three against the third last, etc. etc. After around 25 cycles I had broken half the teeth on the piston so it was only really half cycling. All this seems to have been caused by the offset from the Sorbo pad. I have never run into this problem with ver.2 or ver.3 mechboxes (including ICS split mechboxes) but for some reason it cost me a piston in a ver.7. Just a heads up. Anyone out there know a way to avoid this and still use a Sorbo pad? Currently there is no Sorbo pad and its still damn quiet, also upgraded from the now fragged stock TM piston to a Prometheus hard type.