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Inert Products, LLC
Inert Products, LLC
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Red Grin is a veteran owned and operated business and Michigan's prime provider of high-end Military Simulation gear, Paintball, Airsoft and Radio Control hobby store, providing more than just products.
Available Products
Gear boxes
Show: 
Gear boxes and receivers for Airsoft guns
Displaying 1 to 20 (of 26 products)
Result Pages:  1  2  [Next >>] 
6mm Metal Bushing (JB-27)
$12.00
7mm Metal Bearing Gear Box For Version II (MP5)
7mm Metal Bearing Gear Box For Version II (MP5)
Fits all MP5, M16, G3 Series, except MP5K. Each one has bearings included, works on most other non-Classic Army brands as well.
[ more information ] 
$62.00
8mm Reinforced Gearbox for Version III AEGs
8mm Reinforced Gearbox for Version III AEGs
8mm Reinforced Gearbox for Version III AEGs.
[ more information ]
  
$40.00
AK Type 7mm Bearing Gear Box
AK Type 7mm Bearing Gear Box
Fits all AK, AUG, SIG 550, MP5K series, bearings included. Compatible with most non-Classic Army brands as well.
[ more information ] 
$74.40
Armory USA AK Series Gear Box Case
Armory USA AK Series Gear Box Case
Armory USA AK Series Gear Box Case only.
[ more information ]
 
$60.55
CA249 Metal Gear Box (For MKII Series)
CA249 Metal Gear Box (For MKII Series)
CA249 Metal Gear Box (For MKII Series)
[ more information ] 
$97.50
Complete 8mm Reinforced Gearbox 400FPS Upgrade
Complete 8mm Reinforced Gearbox 400FPS Upgrade
8mm reinforced, 400FPS+ Drop-In gearbox upgrade for version 2 M4 AEGs
[ more information ]
 
$180.00
Complete Armory USA AK Series Version 3 Gearbox
Complete Armory USA AK Series Version 3 Gearbox
Complete Armory USA AK Series Version 3 Gearbox.
[ more information ]
 
$160.00
Extensive Gear Box for SR25
Extensive Gear Box for SR25
Gear Box for the Classic Army SR25, also compatible with most other manufacturers' SR25 models.
[ more information ] 
$72.50
Metal Gear Box (For MP5, M16, & G3 Series)
Metal Gear Box (For MP5, M16, & G3 Series)
6mm Metal Bushing Gear Box For Version II
[ more information ]
 
$33.60
OA PCR-97 M4 Series Factory Lower Gearbox (Fixed Stock)
OA PCR-97 M4 Series Factory Lower Gearbox (Fixed Stock)
Complete Olympic Arms PCR-97 M4 Series Stock Lower Gearbox.
[ more information ]
 
$83.00
OA PCR-97 M4 Series Factory Lower Gearbox (Retractable Stock)
OA PCR-97 M4 Series Factory Lower Gearbox (Retractable Stock)
Complete Olympic Arms PCR-97 M4 Series Stock Lower Gearbox.
[ more information ]
 
$83.00
Oilless Metal Bushings
Oilless Metal Bushings
Systema Oilless Metal Bushings
[ more information ]
 
$10.50
Olympic Arms PCR-97 M4 Series Lower Gearbox - Case Only
Olympic Arms PCR-97 M4 Series Lower Gearbox - Case Only
Olympic Arms PCR-97 M4 Series Lower Gearbox - Case Only
[ more information ]
 
$22.00
Olympic Arms PCR-97 M4 Series Stock Kit
Olympic Arms PCR-97 M4 Series Stock Kit
Complete stock upper gearbox for the Olympic Arms PCR-97 M4 Series
[ more information ]
 
$61.00
Olympic Arms PCR-97 M4 Series Upper Gearbox - Case Only
Olympic Arms PCR-97 M4 Series Upper Gearbox - Case Only
Olympic Arms PCR-97 M4 Series Upper Gearbox - Case Only
[ more information ]
 
$22.00
Olympic Arms/ICS M16 Power Up Kit
Olympic Arms/ICS M16 Power Up Kit
Olympic Arm - ICS M16 Power Up Kit
[ more information ]
 
$105.00
Olympic Arms/ICS M4 Power Up Kit
Olympic Arms/ICS M4 Power Up Kit
Olympic Arms - ICS M4 Power Up Kit
[ more information ]
 
$105.00
pper Gear-Box B. M120 Upgrade Kit (MA-48)
pper Gear-Box B. M120 Upgrade Kit (MA-48)
M120 Upgrade kit - Upper gear box (MA-48) for ICS M16 Series
[ more information ]
 
$75.00
Shim Set by SRC
$3.00
Displaying 1 to 20 (of 26 products)
Result Pages:  1  2  [Next >>] 
  • 30 Day Money Back Guaranteed Changed your mind? NO problem! Your satisfaction is fully guaranteed!
  • We will issue a refund for any reason within 30 days as long as the item is in original condition, sealed, never opened, nor used.
  • If item(s) has been opened, unsealed, or used it may be returned only in case of defects and for exchange only.
  • Defective item(s) (on Red Grin warranty) must be returned in original packaging, supplemented with a description of the problem(s) experienced.
  • Defective item(s) (on manufacturer direct warranty) must be returned directly to manufacturer for an exchange or repair. Please contact manufacturer first to troubleshoot the item.
  • All returns, exchanges and warranty claims must accompany our RMA which can be created from our Returns information page.
  • Customer must pack defective items being returned as if they were new and working with all UPC codes, manuals, software, warning stickers - as in original condition. Failure to do so may invalidate both the RMA and the warranty.
  • Shipping fees and/or return shipping costs are not refundable.
  • Please consult our Warranty & Returns page for complete return policy details.
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