Toptech m4?

[red_noir]

Anyone own one? thoughts?

[LUTNIT]

Don't own one but most other guns with blowback bolts are unreliable at best and prone to breaking. Also I dislike G&G greatly, everyone that has come across my desk has essentially needed all of the internals replaced to make it work reliably.

[spartan117]

Originally Posted by LUTNIT

Don't own one but most other guns with blowback bolts are unreliable at best and prone to breaking. Also I dislike G&G greatly, everyone that has come across my desk has essentially needed all of the internals replaced to make it work reliably.

It uses a different type of gearbox. Where part of the air created from the piston pushes the another piston that's attached to the bolt plate causing it to blowback. So it basically functions like an AEG. I heard it was pretty reliable.

[red_noir]

ya Ive been looking all over for info, apparently is a ver 2 mech box with 8mm bearings also small amount of air is cycled from the main chamber and used to drive the Fake bolt back and spring pressure returns it to the closed position. by use of a second small piston on top of the mech box. so basically its an AEG with pneumatic blow back. you can fire the weapon and hold the bolt and has no adverse effects because the only connection between the fake blow back and the firing of the bbs is air ! I'm just curious as to installing and upgrades to it like a dovetail RIS and maybe a battery crane stock and if anyone has purchased one and what there thoughts are on quality and how happy they are with it or not?

[red_noir]

http://www.popularairsoft.com/top-te...another-m4-aeg


an online review I found with video

[LUTNIT]

Hmmm...I stand corrected on the blowback, thought it was mechanical. Still, Toptech = G&G from what I have read and I don't trust G&G. Also looks like there are some hard/impossible to replace proprietary parts in there. It doesn't blow back enough for me either, showing the hopup and front of the mechbox on the blowback also ruins it for me.

Since you are diverting air from the cylinder to blow back the bolt, you would have to use a much stronger spring to get a decent fps than normal, say even 350-370fps. That in a ver.2 mechbox I don't like, especially a proprietary mechbox shell.

[Dynamo]

wow all that just to get the fake bolt to move back 10mm.. what a revolutionary design..

somehow this makes my choice to get an WA M4/Inokatsu that much more sane.

[red_noir]

speaking of the WE Gas Blow Back M4 Carbine? are they available in Canada?

[The Saint]

Originally Posted by LUTNIT

Since you are diverting air from the cylinder to blow back the bolt, you would have to use a much stronger spring to get a decent fps than normal, say even 350-370fps. That in a ver.2 mechbox I don't like, especially a proprietary mechbox shell.

No, according to RedWolf, the second piston takes off very little fps, something like 3-4fps. Considering how much cylinder volume goes to waste in most guns, it's not a surprise.

http://www.redwolfairsoft.com/redwol...l?reviewID=201

Honestly, people complaining about this being a poor blow back design is being ridiculous. This isn't a real blowback design, all it does is cycle the faux piston. It's bolt cycle, not blow back.

Is that worth holding against it? Not really, especially on top of decocking forward assist, accurate fire selector and radius'd cylinder window. IIRC, the bolt catch also works.

A lot of previous designs have attempted to do bolt cycle. Even TM has recently produced one in the form of an AK. However, the G&G design is probably the best one out of all of them, because the movement actually matches the gun firing, rather than the piston drawing back.

If people want a real blow back gun, get a real blow back gun. This isn't it, no sense in complaining about it.

[LUTNIT]

Only takes off 3-4 fps...must be a really tightly sealed unit, something like a gas block on a real armalites barrel (well, more like an HK416 than M4A1.) Makes sense but I still don't like reducing the air volume on an armalite when they get such horrible hopup airseal to start with. The same springs that shoot 350-370fps in more than a dozen armalites (363mm M4A1's and 509mm M16's) I have worked on shoot 410-440 in my AUG (363mm inner), M14 (500mm inner), and AK (285mm inner.)

The design makes for impossible to find parts if something breaks and this is always a HUGE thing for me. I have had too many "collectors" guns that have some tiny little piece break and then the entire gun is useless. And with G&G's track record for quality, this is highly likely. Though in a pinch you could convert it to a normal armalite without the moving bolt. Rounded cylinder window means little, a ver.2 is a ver.2 is a ver.2, anything added on is a bandaid trying to fix a fundamental problem.

[The Saint]

Well, the gun has been out for only a few months. It's a little early to criticize it on the basis of parts availability. Especially in the case of G&G. Whatever you might have against their quality control, their customer support is above most other companies.

As for the criticism of v2.... Don't buy an AR? Wait until Systema Rev comes out?