Bushings Double

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Is a SP 170 spring for a JG version 2 gearbox for a M4 rifle stable or will it break the gearbox/some parts?

Currently, I've used a SP 160 spring on my gearbox w/ all the internals replaced w/ the maximum rated parts from the highest gear torque, metal cylinder, bushings, double "O" ring metal piston head, high torque red motor, etc. Basically the only remaining original parts are the: all metal exterior body and the gear box itself. Its' average FPS rating is 570 w/ an ROF of 10/sec. I had the set-up go thru a break-in period of around 8,000 rounds @ semi-auto in a span of a month when I had time after work to try it out. Its highest FPS then was 580. Never used it during that period for full-auto.

It would be very helpful if it proves to be disastrous & if it can ruin an already low-maintenance modification, I shall not consider to further up-grade it upon confirmation of a more experienced airsoft enthusiast who have tried & tested it already.

PS: I don't use it for anything else but for vermin control & if ever non-lethal deterrent for law offenders w/in our property.

it sounds like you have done a lot of upgrades to it but if your not sure if your gearbox will handle it dont upgrade anymore. If you need any parts to finish your upgrade though take a look here http://www.airsplat.com/Categories/AC-UPI.htm

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WoodPRO WP0523 Double T Bushing for Shaper Cutters
WoodPRO WP0523 Double T Bushing for Shaper Cutters
$5.99
WoodPRO WP0521 Double T Bushing for Shaper Cutters
WoodPRO WP0521 Double T Bushing for Shaper Cutters
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Double Groove Pulley Sheave 3 Outer Diameter
Double Groove Pulley Sheave 3 Outer Diameter
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Rousselle 4W 40 Ton Double Crank Punch Press Brass Wear Bushing
Rousselle 4W 40 Ton Double Crank Punch Press Brass Wear Bushing
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ZERO MAX 6P26C MODEL 6 26 5 8x19mm CD CLAMPING COUPLING DOUBLE FLEX NEW
ZERO MAX 6P26C MODEL 6 26 5 8x19mm CD CLAMPING COUPLING DOUBLE FLEX NEW
$200.00
1 2 Double Taper Collet1109 OD x 1554 Tall marked R233
1 2 Double Taper Collet1109 OD x 1554 Tall marked R233
$8.95
41 64 Double Taper Collet Collet
41 64 Double Taper Collet Collet
$7.49
1 1 4x2 1 4 BushingNo 54151 Double Hh Mfg
1 1 4x2 1 4 BushingNo 54151 Double Hh Mfg
$5.18
Automatic Screw Southwick  Meister 2850 Double Taper Pick Off Collet Bushing
Automatic Screw Southwick Meister 2850 Double Taper Pick Off Collet Bushing
$35.00
NEW BROWNING R1 1 7 8 BUSHING DOUBLE SPLIT TAPER 1IN X 1 7 8IN
NEW BROWNING R1 1 7 8 BUSHING DOUBLE SPLIT TAPER 1IN X 1 7 8IN
$109.99
NB NIPPON SLIDE BUSH SM 12WUU Double Wide12mm Seals on both sides
NB NIPPON SLIDE BUSH SM 12WUU Double Wide12mm Seals on both sides
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TSD double angle collet 0246 ID 55097 machine shop lathe mill Letter D drill
TSD double angle collet 0246 ID 55097 machine shop lathe mill Letter D drill
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TSD double angle collet 0257 ID 55097 machine shop lathe mill Letter F drill
TSD double angle collet 0257 ID 55097 machine shop lathe mill Letter F drill
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USED ROSS W6076B3407 DOUBLE SOLENOID VALVE A06AH02 FREE SHIPPING
USED ROSS W6076B3407 DOUBLE SOLENOID VALVE A06AH02 FREE SHIPPING
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Lot of 25 Assorted Citizen 28DTA Double Taper Guide Bushings Good Used
Lot of 25 Assorted Citizen 28DTA Double Taper Guide Bushings Good Used
$144.11
DOUBLE HH MFG 1 1 2x2 1 2RepairBush 54161
DOUBLE HH MFG 1 1 2x2 1 2RepairBush 54161
$16.54
Carr Lane CL 28 double locking pin BPDR
Carr Lane CL 28 double locking pin BPDR
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DS60P19 19 Tooth 60 Standard Roller Chain Split Taper Double Single Sprocket 3
DS60P19 19 Tooth 60 Standard Roller Chain Split Taper Double Single Sprocket 3
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1 1 2x2 1 2 BushingNo 54161 Double Hh Mfg
1 1 2x2 1 2 BushingNo 54161 Double Hh Mfg
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DOUBLE HH MFG 1 1 4x2 1 4 Repair Bushing 54151
DOUBLE HH MFG 1 1 4x2 1 4 Repair Bushing 54151
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UNKNOWN BRAND DOUBLE SPLIT BUSHING 2 3 8 ID 4 1 8 OD 1 2 KEYWAY
UNKNOWN BRAND DOUBLE SPLIT BUSHING 2 3 8 ID 4 1 8 OD 1 2 KEYWAY
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Browning Emerson DS60P19 Double Single Roller Chain Split Tapered Sprocket
Browning Emerson DS60P19 Double Single Roller Chain Split Tapered Sprocket
$180.00
Browning DS40H21 Double Single Roller Chain Sprocket 21 Teeth
Browning DS40H21 Double Single Roller Chain Sprocket 21 Teeth
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H Line 3 Pack 7 Double Row Diamond Cup Wheels 7 8 5 8 bushing
H Line 3 Pack 7 Double Row Diamond Cup Wheels 7 8 5 8 bushing
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H Line 3 Pack 5 Double Row Diamond Cup Wheels 7 8 5 8 bushing
H Line 3 Pack 5 Double Row Diamond Cup Wheels 7 8 5 8 bushing
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Double HH Part No 31190 1 x 3 4 Bushing Useable LGTH 193or 1 15 16
Double HH Part No 31190 1 x 3 4 Bushing Useable LGTH 193or 1 15 16
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1 1 2x2 1 2 BushingNo 54161 Double Hh Mfg 3PK
1 1 2x2 1 2 BushingNo 54161 Double Hh Mfg 3PK
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qty 4 7 16 id Stainless Steel Double Split Shaft Collar 1 1 16 od x 7 16 w
qty 4 7 16 id Stainless Steel Double Split Shaft Collar 1 1 16 od x 7 16 w
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Oilite Bronze Double Flange Bushing 3 4 ID x 1 OD x 1 1 2 L FLOD 1 3 8 FLTH 1 8
Oilite Bronze Double Flange Bushing 3 4 ID x 1 OD x 1 1 2 L FLOD 1 3 8 FLTH 1 8
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UNKNOWN BRAND DOUBLE SPLIT BUSHING 3X1 15 16
UNKNOWN BRAND DOUBLE SPLIT BUSHING 3X1 15 16
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BROWNING DOUBLE SPLIT BUSHING BX 1 5 8 BORE ID 3 11 16 OD 3 8 KEYWAY
BROWNING DOUBLE SPLIT BUSHING BX 1 5 8 BORE ID 3 11 16 OD 3 8 KEYWAY
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UNKNOWN BRAND DOUBLE SPLIT BUSHING P1 1 BORE ID 3 OD 1 4 KEYWAY
UNKNOWN BRAND DOUBLE SPLIT BUSHING P1 1 BORE ID 3 OD 1 4 KEYWAY
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Dumont 2 1 2 Style E Broach Bushing 180 degree DOUBLE KEYWAY SAVE
Dumont 2 1 2 Style E Broach Bushing 180 degree DOUBLE KEYWAY SAVE
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6 REDUCER NUT SLEEVE FITTING ADAPTOR BUSHING FITTING DOUBLE THREAD 1 2 20 5 8 18
6 REDUCER NUT SLEEVE FITTING ADAPTOR BUSHING FITTING DOUBLE THREAD 1 2 20 5 8 18
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Double Split Stainless Steel Shaft Collar 7 16 bore ID new
Double Split Stainless Steel Shaft Collar 7 16 bore ID new
$6.15

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