Ak's use the very strong Version 3 gearbox, and upgrades for V.3's are plentiful. There are springs, spring guides, bushings, and many, many more parts. The idea is that any part can be upgraded to make your gun perform better, or last longer. This guide will tell you the compatiable parts that your specific Aeg can take to raise its fps, make it more accurate, or change out your externals for better, or cooler looking externals.
$50 Budget
Accuracy and Range
The ultimate range and accuracy is mainly a combination of a tightbore barrel, and your hop-up system. BBs are also an important factor determining the effective range of a gun. 260 to 360 fps would benefit from a .25 gram bb, 360 to 400 fps would be best off with a .28, or a .3 gram bb. Airsoft Elite's, Ksc's, PHX's, and Tokyo Marui's are all good BBs. Compression also has a big part on your range, good compression = good range, and bad compression = less range.
Tightbore Barrels: There are many brands, and lengths, of tightbores to choose from. Madbull Black Python Barrels are a very good barrel for the price. The standard Ak-47 barrel is 455 millimeters long, so essentially you'd get a 455mm tightbore. But, if you want a significantly longer barrel, you may have to change your cylinder to compensate for the longer barrel.
Note: Generally the tighter a barrel is, the more accurate it will be. Ex. A 6.03 barrel will be more accurate than a 6.04. But, this isn't always the case.
Hop-up Bucking: A poor, damaged, or worn hop-up bucking can hinder accuracy. The bucking is the small piece of rubber that touches the bb, and the "sleeve" that goes around the barrel. The nub of the bucking is the small piece of rubber that touches the bb, to create backspin. There are a few different brands, and types of buckings. The best brand is Firefly, Firefly buckings use a nub with a small "V" cut in them to maximize accuracy, and consistency. If you can't find Firefly, go with a Prometheus. If you still can't get your hands on a Prometheus bucking either go with Guarder, or Systema.
O-Ring and Piston Head: Replacing these household items can fix compression problems and/or give you better compression. Most Piston Heads take size #14, they can be found at Lowes, Home Depot, or your local hardware store.
Springs: A stronger spring doesn't always mean you'll get more range, just more fps. Tokyo Maruis come with a M90 spring which generally produce 270 fps. You can add a M100, M110, or M120 for more power, but they will also put more stress on the gun.
Metal bushings: These are a helpful asset if you plan on upgrading your spring.
Suggestions: Fix your compression problems, get a V.2 Madbull Tightbore, and put in a Firefly Hop-up Bucking.
Total Cost: Madbull Tightbore, combined with a Firefly Bucking will cost around $40-$50 with fixed compression, and without shipping costs.
FPS
Power, power, power, that's what everyone seems to want. However, power comes at a costly price, reliability. Although some power upgrades are reliability friendly.
Springs: There are springs from M90 all the way up to M150, the latter being more powerful. PDI makes very nice springs, however they are in percentages. Ex: 170%. The lowest they go is 150%, and up to 240%, they are much more consistent than normal springs with fps varying only by 10 or less. A standard M90 spring will give you about 280 fps, M100 320 fps, M110 360 fps, M120 400 fps, etc.
Metal Bushings and Metal Spring Guide: If you upgrade your spring you'll want to get metal bushings, and a metal spring guide.
O-Ring and Piston Head: Once again you can find these for cheap at a hardware store. If you replace your current O-ring it will give you better compression, and good compression will give you more fps. Most airsoft guns use a size #14.
Suggestions: Put a stronger spring in your gun, and replace a plastic spring guide and bushings with metal ones. Then fix your compression to give you more fps.
Total Cost: A >M120 Spring, metal bushings and spring guide, plus fixing compression problems will cost around $45-50 excluding shipping.
$100-150 Budget
Accuracy and Range
With some deeper pockets you can get higher quality parts in your replica. You may also want to put a few more parts into your gun to improve this oh-so important characteristic of your gun.
Tightbore Barrel: Some cash can get you the best of the best tightbores on the market. DB Customs (Or Dee's Customs) make some of the nicest barrels on the market. They are custom made, and 6.01mm in diameter, remember airsoft bbs are generally 5.97-5.99mm. PDI Precision also makes very nice tightbores, but are not custom made, and are quite a bit more pricey. (They are also 6.01mm)
Hop-up Bucking: Once again Firefly is the best, followed by Prometheus, Guarder, and Systema.
O-Ring and Piston Head: Pitch your current O-ring and replace it with a size #14 O-ring.
Springs: You can add a stronger spring, to gain a noticeable fps gain, but only a minimal range gain. An M120 will produce about 400 fps, and an M110 will give you about 360 fps.
Metal Bushings: A need to durability if you replace your spring.
Metal Spring Guide: If you replace your spring, you may want to change out your plastic spring guide for a metal one.
Piston: Not completely necessary, but can help if you want the best out of your gun. Duracon pistons are very good, made by Systema.
Suggestions: Replace your stock inner barrel, add a Firefly bucking, and get a Systema Duracon piston.
Total Cost: Dee's Customs barrel, Systema Duracon piston, and Firefly hop-up bucking will run you about $100, excluding shipping.
Fps
Now you can get your gun to shoot powerful, and reliable at the same time.
Springs: You can get any power spring for under $100. That's not the problem though, making it shoot reliably is. I wouldn't go any higher than an M130, unless you could care less about reliability. Systema, Guarder, Prometheus, and Madbull all make good springs. But there isn't really and "bad" after-market springs.
Metal Bushings: These are a MUST if you plan on getting a M120, or higher.
Metal Spring Guide: Also a necessity if you get a M120, or more powerful spring.
O-Ring: Better compression equals more fps. Just go pick a size #14 at any hardware store.
Piston/Piston Head: There are a few different pistons, and it varies what type you should get. Guarder makes some nice pistons. Then just pick a new piston head to go along with your new piston. I like polycarbonate pistons over metal ones because a metal piston can wreck your gearbox.
Battery: You should get a nice 9.6 battery if your going to put an M120, or stronger spring in your gun. Intellect, and Elite are very good batteries.
Gears: Only replace your gears if your running a very strong spring, such as an M130 or higher. Go for torque gears, not high-speed. Systema and Guarder make good aftermarket gears.
Motor: Your stock motor should handle an M120, but if not go for a nice torque motor. EG1000's are a very good torguey motor. Systema's Magnum motor is also a powerful contender.
$200+ Budget
Accuracy and Range
With this much money, it won't be hard to get your Ak accurate.
Tightbore Barrel: Dee's and PDI 6.01 barrels are the top of the line.
Hop-up: Now you've got the cash to replace your entire hop-up unit. But what do you replace it with? Pro-Win makes a very nice metal hop-up that fits Aks. Plus you can replace your bucking with a Firefly or Prometheus bucking to gain even more accuracy.
Piston Head: Duracon's are the way to go, Systema of course.
Spring: Go for a M110, or M120 for some more power.
Metal Bushings: Replace the spring, replace nylon bushings.
Metal Spring Guide: Got a more powerful spring? Get a metal spring guide.
Cylinder: This one's a little iffy to me... But if you want to replace your cylinder, by all means do it.
Externals
Flash hiders
Guarder Ak Slant Brake-$25
Guarder AK SVD flash hider-$45
Guarder AKM flash hider-$25
Guarder Ak-74 flash hider-$25
King Arms Ak-47 flash hider-$20
King Arms Ak-74 flash hider-$25
King Arms Aks-74 flash hider-$50
TSD RPK style flash hider-$35
G&G Ak-47 flash hider-$30
G&G Ak-74 flash hider-$35
G&G Ak-74U flash hider-$40
Classic Army Ak-74 flash hider-$45
Classic Army AKM flash hider-$25
KM Aks-74 flash hider-$50
KM Aks-74U flash hider-$45
KM Aks-74U flash hider with silencing foam-$50
KM Ak Beta flash hider with silencing foam-$50
Grips and Stocks
Classic Army Tactical Ak-47 Pistol Grip-$25
Classic Army Tactical Ak-74 Pistol Grip-$25
Classic Army Railed Ak Handguard-$60
G&P Ak-74 Pistol Grip (Black, OD, and Tan)-$20
King Arms Railed Handguard and Tactical Grip (Black, and OD)-$45
King Arms Railed Handguard, Tactical Grip, and Stock (Black, OD, and Tan)-$70
King Arms Handguard and Stock Set for KA Dragonuv (Black, and Wood)-$120/$160
King Arms Ak-74M Tactical Handguard Grip (Black, and OD)-$40
King Arms Ak-74M Tactical Handguard, and Stock Set (Black, OD, and Tan)-$70
King Arms Ak-47 Handguard, and Pistol Grip (Black, and OD)-$35
King Arms Ak-47 Handguard, Pistol Grip, and Stock Set (Black, OD, and Tan)-$60
Proud Ak-47 Railed Handguard, and Large Pistol Grip (Black, and OD)-$70
MBKs (Metal Body Kit)
Classic Army Ak-47S Metal Frame-$75
Classic Army Metal Front Set for SLR105-$50
Classic Army Metal Receiver for Ak-47
DTP Ak-47 Metal Reciever-$50
DTP Ak-47s Metal Reciever-$50
G&G Magnesium Receiver Kit for Ak-47-$120
G&G Magnesium Receiver Kit for Ak-47s-$120
G&G AK Steel Receiver-$30
G&G Ak-47 Metal Body Set-$70
G&G Ak-47 Steel Top Cover-$20
Wood Kits
CAW Beta Ak Wood Stock Set-$120
CAW Ak-47 Wood Kit-$200
Classic Army Wooden Conversion Kit for Ak-47S-$70
Guarder Ak-47S Wood Kit-$100
Guarder Ak-47 Wood Kit-$150
King Arms Ak-47 Wood Kit-$70
RIS/RAS
Classic Army RAS Kit-$100
G&P Tm AK RAS Kit-$200
King Arms AK Gas Tube Optic Mount-$70
King Arms AK Modular Rail Forend-$120
King Arms AK RAS Full Set-$160
Actron Upper Receiver RIS for Marui AK-$115
G&G AK RIS-$100
Prime Ak-47 RIS-$170
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