APS M4 CQB-R Convertible Barrel Adapter / Extension Set (Thread: 14mm- Negative)

"These adapters are very lightweight aluminum so use caution with the leading threads. This lightweight-ness is helpful for limiting the out front weight. In comparison a steel adapter would have more durable threads but every out front ounce adds up. The coating is a nice matte black and not overly thick so the threads are all tidy. I tested a few random inner barrels and all fit through these adapters just fine. The outer diameter is 18.75mm (0.738").
The listed lengths are the extending length and NOT the overall length. Threaded sections are all around 13.5mm (0.531") proud. Some barrel washers between your outer barrel and the adapter might help squeak out some extra extending if you have to clear a rail end just a bit more.
The smaller 21mm extension will extend your outer barrel 21.2mm (0.833") - overall is 35.2mm (1.384").
The medium 41mm extension will extend your outer barrel 41.1mm (1.620") - overall is 55.1mm (2.171").
The longer 96mm extension will extend your outer barrel 96.2mm (3.788") - overall is 110.25mm (4.339").

"This are solid! very good, only problem is that if u screw it all the way in that thing is not unscrewing lol.

"I bought these to lengthen the barrel of my M4 CQB so I could use a tracer. The metal these are made of, is kind of soft. Though, as long as you don't cross thread them. They will do what they are meant to do, and do it very well. One thing to note is that you will want to thread them on to each other several times before individual use. The paint that is used on the threads can get in the way some times. So screwing them together will rub that off. Other than that, I like them and they work as advertised.

"Will this work on KWA Ronin series rifles? Looking t mount a tracer on it but the M-Loc is in the way.

"Got mine the match my ICS Komodo barrel looks like it was made for it

"Great threads. Screw together flush. Great buy

"They do what they're supposed to - extend the outer barrel. Since they all have threads on the end, you can and are recommended to attach another piece on the end, like a custom flashhider.

The only oddness was when I first took them out of the little baggy they came in. They were attached to each other and covered in grease... Other than that, no problem so far.

"i have the dboys m4 cqb sd can i take the mock silencer off and put the extension on to use the mad bull amplifier.

"will I be able to attach a flash hider to the tip of the barrel?? if I can I will definetly buy this for my M4.

Webmaster: Yes, each section you see has a 14mm negative thread. So any 14mm negative threaded flashhider will fit.

"To answer the question before, yes, the JSL Scar and pretty much all the rest of the SCAR on the market today use 14mm negative thread. So it will fit.

"does this barrel work with a JLS scar? if not can someone please tell me where to find one? thanks

"ICS is 14mm negative thread, JG AEG are 14mm negative thread. So yes, it will fit both of them. It will fit all the AEG other than G&P and Western Arms (in which you will need to purchase a 14mm positive to 14mm negative adapter.)

A very useful extension set when you are just "off" a little on your custom work...

"im interested with this...can it fit my ICS-CXP and JG m16...can somebody help me...thanx...

"it attaches like a silencer but it is a pain in the bum to get off

"John, these are outer barrel sets. It has no effect on your bb shooting what so ever. There are shells for your inner barrel.

If your inner barrel is bent, you'll want to replace that. Also, if your gun shoots hard you might want to consider using heavier bbs.

If it shoots over 350 fps you'll want to use at least Matrix 0.23g or 0.25g.

Also, if your hopup is too high, bbs will curve a lot, especially when wrong bbs are used.