Armalite Pistol?

[yanhchan]

Anyone here made an Armalite pistol I plan to make one with an inner barrel thats about 5 inches long, will the normal M4 cylinder work with this set up?

The idea really came to life when I noticed that I sucked at changing AEP magazines, I figured I might as well just make an AR pistol and share the mags with my primary



Bottom one, still mechbox and motorless. Cut off the buffer tube thing completely. Yes I know if it was real it wouldn't work, so just imigine I'm shooting 9mm....

Project went from Pistol to SMG

[Colin_S]

Yes it'll work bur your FPS will be poor because it doesn't match the barrel length. You should get yourself a MP5K cylinder or perhaps drill a hole near the center of your M4 cylinder. Don't expect high fps from a setup like that though unless you use a really stiff spring.

[The Saint]

You can always use a cylinder that provides you with more volume than needed. That isn't a big deal. More you can just find a 1/2 port cylinder, they're usually listed for MP5K.

[yanhchan]

MP5K cylinder idea sounds good seems easier

I wish I had a drill press and the craftsmanship to drill and work the hole as per Colin's idea...

[Styrak]

Originally Posted by yanhchan

MP5K cylinder idea sounds good seems easier

I wish I had a drill press and the craftsmanship to drill and work the hole as per Colin's idea...

You don't need to do that.

Might save your mechbox some stress, but you don't need to.

[yanhchan]

I'm thinking of an M100 at most for this build since I'll be using it in a machine pistol configuration.

[Mantelope]

Using a cylinder that pushes more air than necessary will degrade your FPS, compared to the proper cylinder.

[ShelledPants]

Hey man, I'm planning the same thing, I figured that if I was getting 320fps with an m90 in an MP5k, then I should be able to get a similar fps with an AR pistol. I'm doing this for the exact same reason too, simplifying my gear to use the same magazines.

Check out my other thread, I'm looking to have an AR pistol holster made.

http://airsoftcanada.com/showthread.php?t=60190

[ShelledPants]

Originally Posted by The Saint

You can always use a cylinder that provides you with more volume than needed. That isn't a big deal. More you can just find a 1/2 port cylinder, they're usually listed for MP5K.

While it does work to use a cylinder which provides too much volume, the spring hasn't reached optimal expansion speed by the time the bb has left the gun on such a short barrel. So the half ported cylinder allows the spring to reach maximum velocity before pressure is exerted on the cylinder, providing the best velocities for your bb.

[The Saint]

I know that already. It's for a pistol, the guy was trying to cut corners, I don't think FPS would be a big deal in that case.

[Schwag]

Unless you already have an armalite you want to butcher, why not just buy the m4 pistol? Probably easier and maybe cheaper than trying to find a short front end and a place to house the battery without a peq.
Almost bought one but took the mp5k instead to save on mags.

[CDN_Stalker]

Originally Posted by The Saint

You can always use a cylinder that provides you with more volume than needed. That isn't a big deal. More you can just find a 1/2 port cylinder, they're usually listed for MP5K.

Once I tried a full cylinder in my MP5 and found a 30fps drop.

[The Saint]

Originally Posted by CDN_Stalker

Once I tried a full cylinder in my MP5 and found a 30fps drop.

He was talking about a M4 cylinder, though. Figured he wasn't going to take the advice and put a full cylinder in.

[ShelledPants]

Originally Posted by Schwag

Unless you already have an armalite you want to butcher, why not just buy the m4 pistol? Probably easier and maybe cheaper than trying to find a short front end and a place to house the battery without a peq.
Almost bought one but took the mp5k instead to save on mags.

In my case I do have an M4 I want to butcher. But who makes the m4 pistol for airsoft?

[CDN_Stalker]

Originally Posted by The Saint

He was talking about a M4 cylinder, though. Figured he wasn't going to take the advice and put a full cylinder in.

True, but the difference between full and MP5 type ported is about the same as MP5 type ported and the half port of the MP5k. So it might affect it. I have a couple MP5k cylinders sitting around doing nothing if he wants one, which would be a good idea if he wants a 5" barrel or close. Hell, maybe even putting the ported cylinder in there already in backwards with the short barrel might be the best idea.