Cybergun x Colt Full Metal M4 Gas Blowback Airsoft Rifle - Golden Eagle
(Model: M4A1)

"Seems to be an amazing budget GBBR and is great at cycling BB's BUT!

It does have its own quirks. The M4 being my service rifle this was an extremely budget pick on my part but I wanted to see how this cheap replica would compare to my service weapon, and its pretty good!
The default magazines that come with the weapon are PRONE to GAS LEAKS from the O ring system in the rear, so you are not getting your bang for your buck. I recommend the GHK magazines if you want to run a solid, trustworthy system.
Also the breach is very solid, very solid bolt carrier group. mine came pre lubed but I used some non silicone oil to lube it up. "Superlube" on amazon, its amazing stuff for GBBR's. I bought the full 14.5 inch version standard, and it works amazingly well. Have NOT field tested it yet but I made sure to run rounds through it and I put about 500 through it. Disassembles just like the real thing, no need for AEG gear work and annoyance. Take the pins out, rock the bolt out, lube this puppy up and she's good to go.

One caveat and issue I have experienced is the bolt slamming BB's into the chamber and the BB's shattering. YOU SHALL use high quality BB's with this replica or it WILL jam up.

"Amazing budget GBB M4. Came with the rail covers and shoots smooth.

"I received this Cybergun M4A1 with a mag filled with gas and no leaks. This thing is solid and works amazing! What a great budget GBBR!