http://www.airgunfix.com/blog/airguns-assembly-disassembly/gamo-cfx-disassembly-guide/

Another great write up Jon, Thanks.

Thanks for the write up Jon,

I plan on pulling my CFX apart one of these days. It shoots tight groups, but the noise and recoil is in need of a little work. Do you have to remove the MB before putting it in the compressor? I just wonder if the plastic MB can handle the pressure. I've had the B3 apart lots of times and have read there's more pressure removing a B3 spring. Any tips will help.

Thanks

The MB holds up fine, just make sure you hold it really well and keep it steady. A bungee helps keep it there.

Thanks Jon will do. I have the pipe compressor and one time I took my hand off and it slipped, there go's the spring a flying. It was half way out so most of the pressure was off, I fasten it down now.

NOTE: As per request of Jon and Splash, this article made by Jon was moved from www.airgunfix.com (http://www.airgunfix.com/) to here at AirgunOne site. Here is the full article:

Taking Apart Your Gamo CFX

DISCLAIMER: Safety first. This tutorial was created for educational purposes. Should you choose to follow this tutorial, no one else but yourself will be responsible for any mishaps or mistakes that occur from the disassembly of your rifle. Please be sure you have the proper tools and skills to do this. Your manufacturer’s warranty will most likely be dishonored should you take your rifle apart on your own.

CAUTION: The factory parts may have sharp and/or rough edges, resulting in injuries if handled without care. Please handle all parts with extreme caution.

Disassembly Suggestions


If you’re not too familiar with the parts and workings of a rifle, it’ll help to have a digital camera handy. Take pictures as you go so if you’re ever stuck with any part, you can refer back to your photos. Have a few rags handy as there may be a considerable amount of grease/oil on the parts. Rags can also save your hands from the sharp factory parts and help when gripping parts. If you can, lay out a large beach towel or sheet of some kind so if something drops it has less of a chance of bouncing to that hidden dimension lots of small gun parts end up in. On spring piston guns, it is highly recommended you use a spring compressor. Serious and/or fatal injury can occur from a spring that’s under tension. Now on to the good stuff…

FIRST: Make sure your gun is unloaded and uncocked.

Removing the Stock


There are 3 screws you’ll have to remove to get your stock off; two in foregrip area and one at the REAR of your trigger guard. The CFX has panels that cover the 2 screws up front. Simply take a flat head screwdriver and gently pry the panels off to expose the screws:


http://i646.photobucket.com/albums/uu182/speedturtle810/Jons%20airgunfix%20picture%20file/Gamo%20CFX%20dis-assembly%20pics/pic1.jpg



http://i646.photobucket.com/albums/uu182/speedturtle810/Jons%20airgunfix%20picture%20file/Gamo%20CFX%20dis-assembly%20pics/pic2.jpg



Once you remove the stock from the action and have set aside your screws and other small parts (rollers, cocking arm shoe, etc) you’re ready to take the rest of your rifle apart.
Follow the rest of the disassembly information found here (with the exception of the barrel removal part) (http://www.airgunfix.com/blog/airguns-assembly-disassembly/disassembly-tutorial-crosman-gamo-theoben-and-others/).


Once you have your rifle apart, you’ll notice that rotating breech staring back at you:


http://i646.photobucket.com/albums/uu182/speedturtle810/Jons%20airgunfix%20picture%20file/Gamo%20CFX%20dis-assembly%20pics/pic3.jpg



Unless you’re sure you have a breech seal leak, I advise you leave that there as removing it may tear up the large breech seal located at the rear of the rotating breech. The best way to minimize damage to that seal/o-ring is to make sure your rifle is properly deburred BEFORE sliding that rotating breech out. Also be sure you have a few extra o-rings handy as the large o-ring may already have some damage from the factory installation.
Removing that rotating breech is simple. First, rotate it a little (around half way):



http://i646.photobucket.com/albums/uu182/speedturtle810/Jons%20airgunfix%20picture%20file/Gamo%20CFX%20dis-assembly%20pics/pic4.jpg



Next, take a flat head screwdriver and GENTLY pry that black plastic tab straight up. Be careful, as there’s a small retainer plate that may fall out in the process:


http://i646.photobucket.com/albums/uu182/speedturtle810/Jons%20airgunfix%20picture%20file/Gamo%20CFX%20dis-assembly%20pics/pic5.jpg



http://i646.photobucket.com/albums/uu182/speedturtle810/Jons%20airgunfix%20picture%20file/Gamo%20CFX%20dis-assembly%20pics/pic6.jpg



That takes care of the rotating breech. Now you can slide it out the rear of your rifle:


http://i646.photobucket.com/albums/uu182/speedturtle810/Jons%20airgunfix%20picture%20file/Gamo%20CFX%20dis-assembly%20pics/pic7.jpg