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March 10th, 2008, 15:24
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#1 |
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Which hopup rubber for my CA M14 rifle?
NOTE: Topic stay M14 rifle. That's a typo. It's an M15A4 rifle...
Two days ago, I upgraded my stock M15A4 rifle. I replaced all the stock CA parts in the piston / cylinder assembly that are knows to be problematic with Systema parts, and I installed Prometheus MS110SP spring. The upgrade was successful as far as I can tell. The gun seems to hit pretty hard. I'll be receiving my chrony today sometime and will be able to post some accurate numbers. I've noticed a drop in accuracy with the gun since I upgraded it. Stock, this gun was pinpoint accurate. Now the BBs seem to stray a bit more than before. I know that the stock CA hopup rubber is known to suck and needs to be replaced. I'm sure that's the problem - the rubber probably isn't right for the estimated 380-ish fps this gun should be delivering with its new upgrades. I know that there are hopup rubbers of different stiffness for different velocities. I'm sort of decided on either Prometheus or Systema, but would like to hear from peoples' personal experiences rather than just the 'common knowledge'. Which of these two, or alternate brand, would be the recommended hopup rubber to use for my gun shooting at this velocity.
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Last edited by Crunchmeister; March 10th, 2008 at 19:10.. |
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March 10th, 2008, 15:36
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#2 |
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I've used and/or dealt with Guarder clear, Guarder black, TM stock, CA stock, Chinaclone stock and Prometheus soft. Out of all of those, the Prometheus soft is the best so far. It's been very consistent and problem free for me.
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"The Bird of Hermes is My Name, Eating My Wings to Make Me Tame." |
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March 10th, 2008, 15:36
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#3 |
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Order and try a few. It'll come down to personal preference as to what you like. I've tried quite a few, and I find sticking to the stock TM version as well as the clear Guarder ones (until they swell up) works best for me. Also, mixing the clear Guarder bucking with the TM little nib seemed to work best.
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"Anyone with a name like Amanishourbariki should give a few letters to the poor Ng family." - Snarfangel, Fark.com |
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March 10th, 2008, 15:55
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#4 |
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Thanks... Just received my chrony, and seems my M15 shoots between 340-360, with most shots being around 350. That's not quite as strong as it should be shooting with this spring, but it's better than stock. Gonna have fun testing my guns wiht this thing
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Last edited by Crunchmeister; March 10th, 2008 at 16:00.. |
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March 10th, 2008, 17:24
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#5 |
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My TM M4 shoots 335-340 fps with a Prometheus MS90SP.
You must have some air leaks if you only get 350 fps with the MS110SP. |
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March 10th, 2008, 17:42
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#6 |
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Yeah, that's a possibility, because that spring should put a full length rifle in the 380-390 range. I can voich that the air seal around the piston head is excellent now. It's possibly the stock CA nozzle causing the problem. Next time I order parts, I'll more than likely grab a new one if Jugglez can get any more of the Systema ones. Ideally, I'd like the gun to have as many Systema components as possible. Or if anyone has some other suggestions for a good nozzle, I'm open to suggestions.
CDN_Stalker has said that he's found some very puzzling results using these springs, with very inconsistent readings. Perhaps this is one of those "off" springs. I know the same spring in my C8 gave some pretty impressive results before the mechbox cracked. I didn't have a chrony, but from what I could tell, it seemed to hit pretty damn hard.
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