When to use a Bore Up Kit

Bar1975 · September 18th, 2013, 01:06

I have an RPK with an upgraded inner barrel of 590mm (6.03mm)

The stock was much shorter so I'm wondering if i need a bore up compression set to support this barrel?

I have read that anything below 600mm 'shouldn't' need a bore up kit. The stock cylinder is also a full cylinder with no ports. I have added a sorbo pad (and Neo pad) to the cylinder head so getting less air volume as it is with that addition.

thoughts?

666 · September 18th, 2013, 01:28

You don't need a bore up kit for PSG1 length barrel. Regular non ported cylinder will also work fine. That's exactly what I have in my RPK for past few years. Don't know anything about sorbo pads, so no comment on that.

Stealth · September 18th, 2013, 10:04

Depends on your FPS and rounds you're trying to shoot.

The higher the FPS and heavier the round, the more it requires additional volume.

ILLusion · September 19th, 2013, 00:11

Bore up kit isn't required. You use them with barrels longer than 590mm, and are also pushing in excess of 420fps.

The minimum strength spring you can use with a bore up kit, is a Systema M120S, or equivalent. (Note: The Systema M120S is different from the standard M120. The power output should roughly be about 420fps with the M120S.)

Home	Forums	Register	Gallery	FAQ	Calendar
Retailers	Community	News/Info	International Retailers	IRC	Today's Posts

British Columbia	Alberta
BCAC	EAR
Op-For	JOC
Northern Arms Airsoft	Skunkworx Airsoft
Airsoft Kelowna	RAAT
Prince George Airsoft	Manitoba
Saskatchewan	MAA
SK Airsoft	Ontario
PDW	Airsoft Ottawa
South Sask Mercs	Snow Dragons
Quebec	1st Ranger Platoon
PQAC	Wolfpack Tactical
1st Pathfinders Regiment	TTAC3
Quebec Airsoft
MTX Airsoft	Atlantic
FAQc	Atlantic Airsoft

September 18th, 2013, 01:06	#1
Bar1975 Trader rating Join Date: Aug 2012 Location: ON	When to use a Bore Up Kit I have an RPK with an upgraded inner barrel of 590mm (6.03mm) The stock was much shorter so I'm wondering if i need a bore up compression set to support this barrel? I have read that anything below 600mm 'shouldn't' need a bore up kit. The stock cylinder is also a full cylinder with no ports. I have added a sorbo pad (and Neo pad) to the cylinder head so getting less air volume as it is with that addition. thoughts?

September 18th, 2013, 01:28	#2
666 Trader rating Join Date: Jul 2004 Location: Toronto, Ontario	You don't need a bore up kit for PSG1 length barrel. Regular non ported cylinder will also work fine. That's exactly what I have in my RPK for past few years. Don't know anything about sorbo pads, so no comment on that. __________________ Op Woodsman. Biggest WW2 event in Ontario.

September 19th, 2013, 00:11	#4
ILLusion GBB Whisperer Trader rating Join Date: Jun 2002 Location: Toronto	Bore up kit isn't required. You use them with barrels longer than 590mm, and are also pushing in excess of 420fps. The minimum strength spring you can use with a bore up kit, is a Systema M120S, or equivalent. (Note: The Systema M120S is different from the standard M120. The power output should roughly be about 420fps with the M120S.) __________________ *Advanced Airsoft Armaments and Enhancements* Quick to the gun, sure of your grip. Quick to the threat, sure of your shot. Diligentia, Vis, Celeritas Accuracy, Power, Speed

September 18th, 2013, 10:04	#3
Stealth Mr. Silencer Trader rating Join Date: Dec 2001 Location: Toronto	Depends on your FPS and rounds you're trying to shoot. The higher the FPS and heavier the round, the more it requires additional volume.

When to use a Bore Up Kit

Upgrades & Modifications