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moto · January 23rd, 2011, 17:20

Q: Is 430mm OK or is it useful to buy 700mm Laylax Bullbarrel and install 550mm Innerbarrel ?
A: 430 is good... 500mm is optimal for barrel to cylinder volume matching.. 550mm requires a VC piston, bore-up cylinder or barrel porting to be efficient.

Q: Is the difference between PDI 6.01 and Prometheus/Laylax 6.03 that big ?
A: Without a doubt... YES. If you have the money, buy the PDI 6.01.

Q: Is it useful to change or is the standart marui hop up good ?
A: Do NOT change out the standard hopup. The Marui is one of the best of not the best available for a sniper rifle.

Q: Wich rubber do you recommend for 550 fps with 0.2 ? KM, Firefly, King Arms, Nineball ?
A: The stock one will hold up but if you are worried about it, I would buy either the Nineball or the Firefly. The firefly can be a problem if not aligned properly but when it is, it works good. Just make sure you buy a "hard" compound if you are worried about durability.

Q: For internals I am interested in PDI parts, I think its good quality. But there are 3 different sets. Wich is the most useful for 550 fps ?
A: If you are going to use the 550mm inner barrel, a Bore-up set is a good idea. Palsonite or not is up to you. Its just a coating that helps prevent corrosion and make the pull smoother (not by much). Ideally you would probably want a Bore-up and VC combo with a 550mm barrel. 500 and below its not really required as the cylinder to barrel volume is fairly well matched.

Q: I would also use PDI, is it OK ? Is the safety still working after installing a new trigger unit ?
A: Go with a PDI trigger, for sure. There is NO safety with the PDI trigger.

I cant really help you with the BBs. I have never used Bioval before. I would suggest a heavier BB than .30 for 550FPS but they will work if that is all you can get.

Th only thing I really see missing is barrel spacers. Get a bunch of them. 5 or 6 atleast if you are going to run 550mm inner barrel.

My set up is as follows:

PDI Cylinder Set (Barikaru Compo Piston)
PDI V-Trigger
PDI 430mm 6.01 10mm OD Inner Barrel
6x PDI Barrel Spacers
PDI 130 Spring (~400FPS)
BB Bastard .30g BBs

As you can see, I like my setup at about 400FPS. The only things I would change to get up to 550fps would be the piston, to something more durable, and the spring.

Hope that helps.

January 23rd, 2011, 17:20	#10
moto Trader rating Join Date: Jun 2006 Location: Petawawa, Ontario	Q: Is 430mm OK or is it useful to buy 700mm Laylax Bullbarrel and install 550mm Innerbarrel ? A: 430 is good... 500mm is optimal for barrel to cylinder volume matching.. 550mm requires a VC piston, bore-up cylinder or barrel porting to be efficient. Q: Is the difference between PDI 6.01 and Prometheus/Laylax 6.03 that big ? A: Without a doubt... YES. If you have the money, buy the PDI 6.01. Q: Is it useful to change or is the standart marui hop up good ? A: Do NOT change out the standard hopup. The Marui is one of the best of not the best available for a sniper rifle. Q: Wich rubber do you recommend for 550 fps with 0.2 ? KM, Firefly, King Arms, Nineball ? A: The stock one will hold up but if you are worried about it, I would buy either the Nineball or the Firefly. The firefly can be a problem if not aligned properly but when it is, it works good. Just make sure you buy a "hard" compound if you are worried about durability. Q: For internals I am interested in PDI parts, I think its good quality. But there are 3 different sets. Wich is the most useful for 550 fps ? A: If you are going to use the 550mm inner barrel, a Bore-up set is a good idea. Palsonite or not is up to you. Its just a coating that helps prevent corrosion and make the pull smoother (not by much). Ideally you would probably want a Bore-up and VC combo with a 550mm barrel. 500 and below its not really required as the cylinder to barrel volume is fairly well matched. Q: I would also use PDI, is it OK ? Is the safety still working after installing a new trigger unit ? A: Go with a PDI trigger, for sure. There is NO safety with the PDI trigger. I cant really help you with the BBs. I have never used Bioval before. I would suggest a heavier BB than .30 for 550FPS but they will work if that is all you can get. Th only thing I really see missing is barrel spacers. Get a bunch of them. 5 or 6 atleast if you are going to run 550mm inner barrel. My set up is as follows: PDI Cylinder Set (Barikaru Compo Piston) PDI V-Trigger PDI 430mm 6.01 10mm OD Inner Barrel 6x PDI Barrel Spacers PDI 130 Spring (~400FPS) BB Bastard .30g BBs As you can see, I like my setup at about 400FPS. The only things I would change to get up to 550fps would be the piston, to something more durable, and the spring. Hope that helps.