[Whamhammer]

From taiwans site this version of the HK417 has a 270 mm inner barrel. So yeh will be overvolumed. For 16 inch barrels I would expect around 400mm inner barrels like the cyma and the classic army have.

Wow, thats the first V2.5 that I have seen with that short of an inner barrel! Not to say that the setup isn’t valid, or anything. I am figuring on going down to a 363mm or 300mm with my M110 SASS to support some really heavy stuff.

 

[Dolovo]

A&K and Classic Army have pretty much always used less than a 400mm inner barrel on its CA25 carbines…..

Classic Army M110 LS12 Airsoft AEG Rifle w/ M-LOK Handguard (Color: Black)

Shop ... , Airsoft Guns, Airsoft Electric Rifles

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Interesting the ones that get sold here are 410 mm inner barrel according to gunfire M110-13 Keymod Assault Rifle Replica - DE

 

[Lightf4ng]

That's an interesting rule. I wrote up the DMR rules for Ballahack, and I went for a 16" minimum barrel length requirement. I recall doing that to open up more replica options so the DMR class would be more frequently utilized, but I can't recall what specific replicas I had in mind. I wonder why the fields in question went for 20" instead.

Totally understand doing the caliber restriction, though. It's easy for the chrono marshal to figure out what makes a qualified DMR based on mag type.

bUt mY sSx303 is DmR!


Nah I don't have one but I have a 300 mm asg mk23 and 220 mm TM

 

[Akami]

Not exactly sure what advantage that you are talking about, I know of some though.
Please clarify your point.

I can't say much lest I gave wrong information since that topic is still beyond my understanding. But the basic is that since the compression area lays a few while after the piston moves, it gave the piston faster speed before it starts compressing air for real, giving us higher pressure spike. It supposedly helps us gain range in limited power build.

 

[Lightf4ng]

I can't say much lest I gave wrong information since that topic is still beyond my understanding. But the basic is that since the compression area lays a few while after the piston moves, it gave the piston faster speed before it starts compressing air for real, giving us higher pressure spike. It supposedly helps us gain range in limited power build.

Partly true if you are using lighter bbs with short barrel and a weak spring.

 

[Whamhammer]

Partly true if you are using lighter bbs with short barrel and a weak spring.

I can't say much lest I gave wrong information since that topic is still beyond my understanding. But the basic is that since the compression area lays a few while after the piston moves, it gave the piston faster speed before it starts compressing air for real, giving us higher pressure spike. It supposedly helps us gain range in limited power build.

What you are speaking to will benefit the joule output of a lightweight bb, but it wont make it gain range more than the same BB, with same barrel/hopup setup in any other replica that is outputting that amount of joules with that BB.