A&K NS15 Full Metal Lipo Ready M4 CQB Stubby Killer Airsoft AEG Rifle (Model: Delta)

"3 stars. The external quality is great. The gun feels solid, the only problems ive had externally is the mock bolt won't go far enough back to adjust the hop up without assistance and the battery door on the back needs to be slammed shut to stay latched. Now internally. It's horrible. Out of the box I was getting this absolutely horrible sound. Worse than any aeg I've ever owned. It got maybe 4 shots of test fire out of it before the gearbox locked up completely. I released the anti reversal latch and the gearbox reversed and allowed me to get 4 more shots to test fps. It was shooting 230... Complete disappointment. I pulled open the gearbox and replaced the piston and cylinder head, then I went to shim it. It was impossible to shim. I took I closer look at the gearbox and noticed it was warped where the spur gear is.
Also it says it comes with bearings but they are only on one of the gears
TLDR: came with a warped gearbox needed to spend unnecessary money on a new gearbox, still hasn't come.

"This was my very first airsoft purchase, wanting something durable and well-received that would last me as long as realistically possible. As a new player I did not want to be bothered with opening up and figuring out the ins and outs of the internals.

For a few games over the course of a few weeks, the gun worked very well, with no issues barring an occasional jam. The gun feels very good and durable with the metal body, though I feel like it is a bit overkill. I chrono'd ~360fps with .2 bbs, using a 9.6v NiMH battery.

Sadly, the gun seized up mid-engagement, with the motor no longer responding to a trigger pull despite a charged battery. I also checked the fuse and found it to be in good condition along with the immediate connections I could see. A player on the field suggested it could be an anti-reversal latch issue in the gearbox, based on their personal experiences, but with no airsoft techs on site and considering my lack of knowledge with disassembly and troubleshooting, the issue remains unsolved.

I'm learning firsthand that one must be prepared from the start to thoroughly familiarize oneself with the disassembly and reassembly of these machines if really serious about enjoying the sport and justifying the money you will spend.

No matter how good the reviews are, no matter how expensive the gun is, no matter what renowned brand you choose, the gun will eventually critically malfunction, and it will up to you and/or your wallet to resolve the issue or be left with a big intimidating paperweight. Food for thought for newer players moving forward.

"When I got this gun it was okay . After about three weeks I was shooting it and the gun broke without any sort of pressure . The gear gun stopped working and it's horrible do t buy it

"I would not purchase this gun. I bought this for my brother as a gift. The gun stopped shooting during the first game. Motor terminal detached. Easy fix. Then the plastic from the stock started to get really sticky everywhere, as well as the angled (right hand only) motor grip. FPS is now at 270-280 on a .25. I took the gearbox out to find out why, the gearbox is cracked towards the back where the spring is. I haven't even addressed if there's an internal compression issue because the buck basically stops at the cracked gearbox. I regret gifting this broken gun to another person and if I could've gotten a different gun, I would have.