IREclipse
New Member
TM MP5A4, UHC MP5SD5
Posts: 70
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Post by IREclipse on Oct 2, 2003 9:16:43 GMT -5
I plan on getting a PDI spring to get my MP5a4 up to 350fps and systema metal bushings, so do I need any other reinforced internal parts for longevity?
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Post by luke213 on Oct 2, 2003 9:23:19 GMT -5
You will probably get by fine with stock gears at that speed, but it might blow up the first day. It's all about chance when it comes to upgrading, but chances are you will be fine with just that.
Luke
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IREclipse
New Member
TM MP5A4, UHC MP5SD5
Posts: 70
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Post by IREclipse on Oct 2, 2003 9:30:00 GMT -5
If it "blows up" (dont like the sound of that..) couldent I just get reinforced gears to replace the old stock gears if it breaks?
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Post by luke213 on Oct 2, 2003 9:41:32 GMT -5
You can replace anything in the gun that could "blow up" but basically with the production standards of airsoft it's anyone's guess how long it will run till it dies. Though that also goes for stock guns, but more so for upgraded guns due to the higher stress on the internals.
Luke
EDIT: And I'm not seriously saying it will explode, just putting it in a worse case view. Chances are your gonna strip your gears.
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Post by Knief on Oct 2, 2003 11:18:38 GMT -5
You should be set, atleast for a while with 350, metal bushings and stock gears. I've been running at about 370 with just the spring and bushings for over a year now with regular use and i'm still going fine. Newman had the same for a while. Then he put in a high speed motor and it cracked his box. But he had been running it for about a year before that happened, if i recall correctly. As long as the parts are installed properly, you shouldn't have a problem for a while. You could, but it's not likely. And when they die, they die. It hapens, it's something to expect. when that comes along, you'll just have to buy more parts. It's always a good excuse to upgrade too.
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Post by xaos on Oct 2, 2003 14:52:26 GMT -5
On the other hand, my stock MP5 stripped its gears out after less than 10000 rounds. The amount of time a gun will last (even a stock one) is basically a crapshoot. Sometimes you get lucky (i.e. people that run 400fps guns with only bushings for years without failure), sometimes you get bit (like me). "blows up" = something bad happens, not BOOM! Like Luke said, you'll likely strip out gears first, and you may chew off the teeth on the piston (my MP5 stripped one gear and the piston). And repair is relatively simple if you can understand the relatively simple mechanics behind a mechbox. AirsoftPlayers has a very good guide to mechbox disassembly/upgrade if/when you need it.
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Post by Ice on Oct 2, 2003 14:56:24 GMT -5
I feel sorry for you xaos, I had a sd5 do that, but i prolly fired a good at least 100,000 rounds prolly more, i went through about 5000 rounds a week. (drum mag). But its all luck.
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Post by GabeAco on Oct 4, 2003 19:55:23 GMT -5
If you go with a 140% (340fps) spring i would say you would be ok with just bushings. If you want to go with 150% (360fps)spring i would recommend gears as well.
They are correct, you never know how long it will last when you start to upgrade. If you strip something out, you can count on replacing the gears and the piston, from my experience
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IREclipse
New Member
TM MP5A4, UHC MP5SD5
Posts: 70
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Post by IREclipse on Oct 10, 2003 9:09:04 GMT -5
Are the ratings of 350fps, and 400fps etc. measured with guns firing off .2s or .25s?
So if I decided to upgrade it to 400fps would I need anything else other than the reinforced gears, and metal bushings, if so how much would the other parts cost? Thanks!
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Post by luke213 on Oct 10, 2003 9:27:20 GMT -5
Yes chrono rating are done with .20's and using metal bushing's and reinforced gears should hold.
Luke
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Post by GabeAco on Oct 10, 2003 9:49:23 GMT -5
I would strongly advise against going above a 150% spring. It is just not necessary. You also will be putting a lot of stress on other components of the gearbox, such as the box itself, the spring guide, just to name a couple. JMO
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Post by luke213 on Oct 10, 2003 10:26:38 GMT -5
Well I was gonna add something to my previous post to, to check out the accuracy article at Airsoftplayers but they're down right now, so you can't but. I would say the brunt of the article was that you will gain some overall range, and a little effective range. Though your biggest gain overall will be running a heavier weight BB, such as a .30 or something in that weight or even a .25. Personally I run .20's, but my reason is because of price, for the amount of shooting that I do in a week, it's just allot cheaper for me to run lighter BB's. None the less when ASP comes back up check out the article it may help you decide as far as upgrades.
Luke
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Post by xaos on Oct 12, 2003 17:01:22 GMT -5
In addition to what Gabe said...
If you choose to go above 350fps, you're looking at excluding that particular gun from most organized events. The MiA rules are 360, otherwise you're looking at a minimum engagement distance...and most events simply say 350 max, 550 for snipers.
Also...when you can look at the article at ASP, you'll see that 350 vs 400 isn't going to make too incredibly large of a difference. The biggest difference you will see is by changing bb weight. Go with 350...it's less stress on the gun, you'll be able to use it for all events, and it'll still perform better than a stock gun.
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