Airsoft GI small logo

Modify AEG Cylinder Set for M4/M4 RIS

[P15E02][02257 / MOD CYL SET M4 / GB-01-52]
( 3 Reviews ) ❤ Add to Wishlist
Orders over $149 qualify for free shipping
Free Shipping for orders over $149 No Coupon needed

The Modify Cylinder Set for the M4 Series has all the necessary parts to upgrade or replace the cylinder assembly of an M4 gearbox. The Cylinder Set includes a cylinder head, air seal nozzle, aluminum piston head, the cylinder, and a polycarbonate piston. The Modify series of upgrade parts are compatible with most major brands of AEG. You can expect the same level of quality from these parts as Guarder and Systema parts for a fraction of the price.

Package Includes:
Stainless Cylinder Head
Air Seal Nozzle with o-ring
Aluminum Ventilation Piston Head
Super Lucid Chromium Plating Cylinder
Polycarbonate Piston

S303 Stainless Steel / Brass / Polycarbonate / Aluminum / Acetal

Manufacturer: Modify
Color: Silver, Black, Purple
Material: Metal / Polycarbonate
Package Includes: One (1) Cylinder Set
see 3 reviews | Write a Review
verified buyer
A. TAIN | 2007-06-11
First of all, the product description is wrong when it says this cylinder set comes with an aluminum piston is actually a black pom polycarb piston head with clean vented holes.

The cylinder head is high quality stainless steel with good quality double ring rubber seal that fits very tight with the cylinder which provides awesome air sealing.

the cylinder is virtually spotless and dust free internally you can use it right away without cleaning , very high quality.

the piston head is guarder quality black polycarb with clean vented holes. It is solid, tough, reliable and comes with ball bearings for the spring so make sure u tighten the screws very tight or else the spring will spin your bearings and polycarb screw support loose (the little polycarb hat the holds the bearings together with the help of the screw).

the included piston is purple/grape colored polycarb with last tooth being metal. It is guarder quality and durable.

BUT, this kit has one FLAW...The O-Ring for the piston head is TOO SMALL for the cylinder and provides terrible compression. It seems like both the bore up and non bore up echo 1 cylinder sets have O Rings that are too small for the cylinder.

As a side note I am using this set in a stock spring ICS M4 shooting at around 310 fps and so far everything is still brand new after going through 20000 bbs today. With such low stress settings and an 8.4v battery, I think this gun will will last me a million or so shots with this durable kit installed. However, higher ROF and fps settings will obviously cut down gun life down dramatically.
M. CHAO | 2007-08-28
i just bought this yesterday after school. dropped by and picked this sucker up along with a prowin piston. i installed it later in the night at like 11. everything was very easy to put in. it was recommended by one of the guys to switch out the oring on the piston head as apparently it doesnt create a proper seal causing loss of pressure. anyways everything is a VERY snug fit. after replacing the oring with the original one the piston takes a large amount of force to manually push into the cylinder. the cylinder head sticks on nicely as well. i didnt use the piston it came with as it is supposedly only able to withstand up to a spring of 1 joule. so installation was a breeze and i reassembled everything. took it outside to shoot and i noticed it sounded alot better than the stock stuff. noticably quieter. only loud thing is the motor... so i shot a couple on semi. and then i went to full auto. i got a higher rof i think its from the lighter piston but im not sure. after shooting about a 40 rounds off. i heard the gb give off a nasty errr. so i immediately stopped shooting. i took it inside and checked it out. it sounded like the piston was stripped or something stripped. so i took everything apart and checked. nothing. then i noticed alot of bbs stuck in my silencer. so the blockage caused the air shot out from the nozzle to be pushed back causing improper cycling of the piston. lets say i was very relieved that i didnt just waste 20 dollars on a piston. to say the least this kit is amazing. great compression. everything looks like high quality parts. give it a give it a 10 outta 10
verified buyer
S. ANDRASSY | 2009-03-16
Product Information:
Th kit is great!! Adds alot of compression to your AEG. The Piston Head is not aluminum but polycarb as well as the piston. Very easy to install. New air nozzle seals tightly to the tappet plate as well as the cylinder head. Cylinder is super smooth and precisionly pollished. P-head s none the less ported. The piston has a clear purple color to it, its no very appealing but then again it does not need to be. The piston head o-ring is fine and provides an excellent seal...seriously people its called cylinder lube. BTW I installed this into my custom m733 which preiously was an m16 performed like a champ. Of coarse before doing anything you should shim and lube your gearbox before. Also picked up a ball bearing spring guide. It also has a Madbull M120 installed running on a large 9.6v 4500 batt. Oh and the nozzle which seems to add accuracy....don't know why but its alot better.

quality parts
great compression

Search Tags: Internal Upgrade Kit Compression Version 2 Air Seal

For Questions, Answers and Comments:

Talk about the Modify AEG Cylinder Set for M4/M4 RIS with your friends on the facebook comments box below:
Copyright © 2022 Airsoft GI

All airsoft guns are required to have the tip (1/4 inch) of the barrel permanently colored in blaze orange. No person may openly display or expose any imitation firearm (replica firearm), in a public place. The term "public place" means an area open to the public or exposed to public view and includes streets, sidewalks, bridges, alleys, plazas, parks, driveways, parking lots, automobiles, whether moving or not, and buildings open to the general public, including those that serve food or drink, or provide entertainment, and the doorways and entrances to buildings or dwellings and the grounds enclosing them.

Any person who changes, alters, removes, or obliterates any coloration or markings that are required for by any applicable state or federal law or regulation, for any imitation firearm (replica firearm), or device in any way that makes the imitation firearm (replica firearm) or device look more like a firearm is guilty of violating the state or federal law.

By accessing the Site, you certify that you are older than 18 years of age or the age of majority where you live, whichever is older; that you are the owner of any credit card used to purchase on items on the Site; that you are familiar with all local laws in your area affecting your legal right to access airsoft products; that any products you buy are for your own private enjoyment and that you will NEVER share these products with a minor in ANY WAY.