Sun Projects M40XB tightbore

The Alabama Tick · April 16th, 2006, 19:48

Hi everyone. I just picked up a Sun M40XB a couple of days ago, it was new but the nozzle was bent(store employee didn't know not to put in an empty mag and close the bolt) so I got it for a song. Being a machinist, I'm gonna re-make the nozzle out of stainless, problem fixed. The adjustable hopup unit was real easy to find info on, it's made by PDI and goes for roughly $60.

NOW.....

Here's where my problem is. I've gone one a google safari and no matter how long I've looked, I can't seem to find any REAL info about a tightbore for this gun. I've only found brief, vague mentions of a Systema 6.04. Anyone know of a company that makes a 6.03, and if the Systema one is the only one available, how much does it cost?

Thanks for your help.

Pollock · April 17th, 2006, 12:59

DEA sells the M40, maybe they have some parts. How is the rifle? I hear it's all metal and wood. Sounds pretty nice.

The Alabama Tick · April 17th, 2006, 23:07

I haven't fired it yet, gonna fix the cylinder head this week. It does indeed have a wood stock, and not a single plastic piece inside except for some rubber seals. Everything is metal, and most of it is machined. From what I've seen, I personally think it's better made than the APS2(my opinion).

I'm not familiar with DEA....

Oz · April 18th, 2006, 03:55

... correct me if Im wrong, but wasnt one of the 'upgrades' on the DX that it used standard AEG barrels?

The Alabama Tick · April 18th, 2006, 23:44

That would be the M40A1. The XB has an inner barrel with an outer diameter of 10mm(standard AEG barrels are 8.5) and the hopup is different(lots simpler, in fact).

UPDATE: I finished the nozzle, test-fired it. Fixed hopup does practically nothing, adjustable hopup is on the way soon. The velocity is at least 350(my estimation), gonna chrono it soon. I will be upgrading the spring.

Skruface · April 19th, 2006, 01:46

OK Products (Japan) makes a series of 6.03mm stainless steel inner barrels for the M40A1:

http://www.wgcshop.com/pcart/shopper...9064459b7632c4
http://www.wgcshop.com/pcart/shopper...9064459b7632c4

The Alabama Tick · April 19th, 2006, 21:24

I've just ordered a PDI hopup unit, these are designed to take standard AEG barrels! I didn't know this mod existed, so OZ, you were right. I'll be purchasing a Prometheus tightbore of the appropriate length when the hopup unit arrives.

The next mod will be the spring. Still have to find out if I need to replace any trigger parts or if it's strong enough stock....

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April 16th, 2006, 19:48	#1
The Alabama Tick Trader rating Join Date: Dec 2004 Location: Vancouver, BC	Sun Projects M40XB tightbore Hi everyone. I just picked up a Sun M40XB a couple of days ago, it was new but the nozzle was bent(store employee didn't know not to put in an empty mag and close the bolt) so I got it for a song. Being a machinist, I'm gonna re-make the nozzle out of stainless, problem fixed. The adjustable hopup unit was real easy to find info on, it's made by PDI and goes for roughly $60. NOW..... Here's where my problem is. I've gone one a google safari and no matter how long I've looked, I can't seem to find any REAL info about a tightbore for this gun. I've only found brief, vague mentions of a Systema 6.04. Anyone know of a company that makes a 6.03, and if the Systema one is the only one available, how much does it cost? Thanks for your help. __________________ Someone order a sniper?

April 17th, 2006, 12:59	#2
Pollock Trader rating Join Date: Jan 2006 Location: Caledon	DEA sells the M40, maybe they have some parts. How is the rifle? I hear it's all metal and wood. Sounds pretty nice. __________________

April 17th, 2006, 23:07	#3
The Alabama Tick Trader rating Join Date: Dec 2004 Location: Vancouver, BC	I haven't fired it yet, gonna fix the cylinder head this week. It does indeed have a wood stock, and not a single plastic piece inside except for some rubber seals. Everything is metal, and most of it is machined. From what I've seen, I personally think it's better made than the APS2(my opinion). I'm not familiar with DEA.... __________________ Someone order a sniper?

April 18th, 2006, 03:55	#4
Oz Trader rating Join Date: Mar 2003 Location: Vancouver	... correct me if Im wrong, but wasnt one of the 'upgrades' on the DX that it used standard AEG barrels?

April 18th, 2006, 23:44	#5
The Alabama Tick Trader rating Join Date: Dec 2004 Location: Vancouver, BC	That would be the M40A1. The XB has an inner barrel with an outer diameter of 10mm(standard AEG barrels are 8.5) and the hopup is different(lots simpler, in fact). UPDATE: I finished the nozzle, test-fired it. Fixed hopup does practically nothing, adjustable hopup is on the way soon. The velocity is at least 350(my estimation), gonna chrono it soon. I will be upgrading the spring. __________________ Someone order a sniper?

April 19th, 2006, 21:24	#7
The Alabama Tick Trader rating Join Date: Dec 2004 Location: Vancouver, BC	I've just ordered a PDI hopup unit, these are designed to take standard AEG barrels! I didn't know this mod existed, so OZ, you were right. I'll be purchasing a Prometheus tightbore of the appropriate length when the hopup unit arrives. The next mod will be the spring. Still have to find out if I need to replace any trigger parts or if it's strong enough stock.... __________________ Someone order a sniper?

Sun Projects M40XB tightbore

Upgrades & Modifications