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Post by shotysnipes77 on Sept 14, 2014 19:56:28 GMT -5
I am getting an M-4 CM, and the seller tells me it shoots at 360 ( perfect for CQB!). But I was wondering , for when I play outdoors, of there were any parts, or things I could do to raise the FPS in any way. Thanks for helping this newbie out. Shotysnipes77
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Post by X on Sept 14, 2014 21:35:05 GMT -5
Changing the spring will do it. But 360 FPS is totally adequate for outdoors and is too hot for CQB. It needs to be <350. I would not change the spring unless you are lowering it for CQB. Instead get a high quality barrel and hop up parts.
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Post by dizzyshot (Bad Company) on Sept 14, 2014 21:58:13 GMT -5
I think he means for Kalamazoo airsoft X. They had to up their FPS limit because they we're selling brand new guns that where shooting 360 out of the box.
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Post by shotysnipes77 on Sept 14, 2014 22:12:14 GMT -5
I believe there's a 10 FPS leeway for CQB, thanks for responses.
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Post by Tank on Sept 14, 2014 22:52:05 GMT -5
I believe there's a 10 FPS leeway for CQB, thanks for responses. On MiA the 10 FPS leeway is what makes 350 allowed for CQB. The actual limit is 340 FPS, but then you have the 10 FPS leeway. But now it sounds like Kalamazoo has upped it to 360 at their field. I have no knowledge either way about Kalamazoo, other than what was just posted.
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Post by shotysnipes77 on Sept 14, 2014 22:57:12 GMT -5
I believe there's a 10 FPS leeway for CQB, thanks for responses. On MiA the 10 FPS leeway is what makes 350 allowed for CQB. The actual limit is 340 FPS, but then you have the 10 FPS leeway. But now it sounds like Kalamazoo has upped it to 360 at their field. I have no knowledge either way about Kalamazoo, other than what was just posted. I know of a few places where with leeway it is 360, but thanks for the info. So if I was to want to raise FPS, what exactly would I need? Just the spring? Thanks for all the help.
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Post by Tank on Sept 14, 2014 23:16:48 GMT -5
On MiA the 10 FPS leeway is what makes 350 allowed for CQB. The actual limit is 340 FPS, but then you have the 10 FPS leeway. But now it sounds like Kalamazoo has upped it to 360 at their field. I have no knowledge either way about Kalamazoo, other than what was just posted. I know of a few places where with leeway it is 360, but thanks for the info. So if I was to want to raise FPS, what exactly would I need? Just the spring? Thanks for all the help. And those places don't post games on MiA, otherwise they would have to note that they don't follow the MiA FPS guidelines. On to your question... If you are going to beef up your spring, you will want to correct AoE, re-shim the gearbox, and possibly think about a MOSFET, depending on how high you are going. While you are in there, you should check over your compression and make sure it's all good.
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Post by shotysnipes77 on Sept 14, 2014 23:21:20 GMT -5
Alright thanks man.
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Post by Squirrel on Sept 15, 2014 18:37:36 GMT -5
If you have a stock barrel, a tight bore / longer barrel will also raise your FPS. You could get a longer barrel and run a barrel extension / fake suppressor to cover it. It is hard to say how much it would raise though.
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Post by Stinger on Sept 15, 2014 23:33:24 GMT -5
If you have a stock barrel, a tight bore / longer barrel will also raise your FPS. You could get a longer barrel and run a barrel extension / fake suppressor to cover it. It is hard to say how much it would raise though. Actually, there's a higher likelihood of this lowering the FPS due to undervoluming the gun.
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T6e9a
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Post by T6e9a on Sept 15, 2014 23:38:47 GMT -5
Most stock guns aren't very well matched volume wise, and thus, you can extend it a decent amount with it still being close enough matched in volume.
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Post by Stinger on Sept 15, 2014 23:43:35 GMT -5
Most stock guns aren't very well matched volume wise, and thus, you can extend it a decent amount with it still being close enough matched in volume. Yes, but unless it's overvolumed right now, that wouldn't make any difference. If it did, it would be a detrimental difference. Considering it's a G&G (I assume he meant Combat Machine when he said "CM"), it's going to have a low cylinder volume. Getting a longer or tighter inner barrel will not increase the FPS.
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Post by T6e9a on Sept 15, 2014 23:52:38 GMT -5
He can go a little longer(not much) with a TBB. But with stock combat machines having a 3/4 or 1/2 cylinder(depending on model) they tend to be closer matched to their appropriate volume. So really the only Benefit would be with a same length TBB.
In which case, an install of a full cylinder will help better match a longer barrel, especially if the AOE were to be corrected.
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Post by Squirrel on Sept 16, 2014 6:18:08 GMT -5
Ah ya, forgot about the Combat Machine being ported shorter. All of my guns have a 3/4 or full cylinder now. I guess OP's only choice is to do a spring change and probably work on compression a bit.
The stock G&G green bucking seems to make a great seal in the several projects I've used it in, so that could probably stay. The gearbox would probably benefit from some compression mods to help with consistency and boost FPS slightly.
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Post by Stinger on Sept 16, 2014 7:55:17 GMT -5
Yes Basically, seal everything up to get perfect compression, and then change springs from there to what you want.
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