Airsoft Canada - View Single Post - Problems/Questions Upgrading M733 To 400 Fps

GlockFu · June 29th, 2006, 14:14

I've got an M733 that I'm having a hard time getting to 400 fps. All I have in it so far is metal bushings, M120 spring, KM tightbore and Systema Duracon Piston Head with bearings. It is only registering at an average of 362 fps with .20 bbs

I've talked to a lot of people and have done a lot of research and one of the things that I think will help is changing my cylinder from the stock closed cylinder (don't know why TM put these in there) to an M4 cylinder. That's the only problem I can find but I really doubt it will jump the fps to 390s.

My friend has the exact same gun (we ordered it together) and he was having the same problem. He finally got it to average 397fps but he is using metal bushings with dual oil chambers, same piston head as me and a SP120 spring. Before he changed the closed cylinder to an M4 cylinder it got 385 fps, thats why I don't think my gun will jump to 390's with the cylinder change.

I was thinking about chaging out my spring to an SP120 as well but after doing research I think that spring is too strong for my internals. Also, when he shoots semi auto it sounds like his motor is straining a lot more then mine. So I thought, why don't I just switch out some of my other compression parts instead to get more fps and so my gun doesn't have to take as much abuse.

These are the parts I was thinking about getting. Any suggestions of which ones to get and which ones arent worth the money would be cool...
1) Systema cylinder $10 (I already have a CA one someone gave me tho)
2) Systema Nozzle $8.50
3) Systema Spring Guide with Bearings $15.50
4) I was thinking about getting a new Cylinder Head but I'm not exactly sure what that would do

Sorry that was so long but I have a couple more questions...
1) Why the hell isn't my gun shooting 390's with what it has??
2) Is the SP120 too strong without upgrading my other internals (gears, piston, ect...)
3) What parts would you suggest to increase my fps to close to 400 fps

THANKS FOR ANY HELP!!

June 29th, 2006, 14:14	#1
GlockFu Trader rating Join Date: Jun 2006 Location: Vancuver	Problems/Questions Upgrading M733 To 400 Fps I've got an M733 that I'm having a hard time getting to 400 fps. All I have in it so far is metal bushings, M120 spring, KM tightbore and Systema Duracon Piston Head with bearings. It is only registering at an average of 362 fps with .20 bbs I've talked to a lot of people and have done a lot of research and one of the things that I think will help is changing my cylinder from the stock closed cylinder (don't know why TM put these in there) to an M4 cylinder. That's the only problem I can find but I really doubt it will jump the fps to 390s. My friend has the exact same gun (we ordered it together) and he was having the same problem. He finally got it to average 397fps but he is using metal bushings with dual oil chambers, same piston head as me and a SP120 spring. Before he changed the closed cylinder to an M4 cylinder it got 385 fps, thats why I don't think my gun will jump to 390's with the cylinder change. I was thinking about chaging out my spring to an SP120 as well but after doing research I think that spring is too strong for my internals. Also, when he shoots semi auto it sounds like his motor is straining a lot more then mine. So I thought, why don't I just switch out some of my other compression parts instead to get more fps and so my gun doesn't have to take as much abuse. These are the parts I was thinking about getting. Any suggestions of which ones to get and which ones arent worth the money would be cool... 1) Systema cylinder $10 (I already have a CA one someone gave me tho) 2) Systema Nozzle $8.50 3) Systema Spring Guide with Bearings $15.50 4) I was thinking about getting a new Cylinder Head but I'm not exactly sure what that would do Sorry that was so long but I have a couple more questions... 1) Why the hell isn't my gun shooting 390's with what it has?? 2) Is the SP120 too strong without upgrading my other internals (gears, piston, ect...) 3) What parts would you suggest to increase my fps to close to 400 fps THANKS FOR ANY HELP!!