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Crunchmeister · March 10th, 2008, 14:24

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.

March 10th, 2008, 14:24	#1
Crunchmeister Trader rating Join Date: Nov 2007 Location: In your bedroom going though your underwear drawer	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. __________________ Last edited by Crunchmeister; March 10th, 2008 at 18:10..