Tube extension for 930 SPX--Your experiences?

jreXD9 · October 11, 2016, 09:15 PM

I'm thinking of adding a +2 or +3 or +4 tube extension to my 930 SPX. Has anyone else done that? What's the main issue to look out for? What brand did you buy? I miss the 8+1 capacity of the 590 I had.

jreXD9 · October 14, 2016, 07:58 PM

dang.....nobody?

MarkCO · October 15, 2016, 09:05 AM

When you add length to the magazine tube of the 930, that is where a good portion of the malfunctions originate. Shell surge is a thing and since the 930 does not release the next shell on the trigger pull, but while in recoil...not a good combination and well outside of the engineered operating window.

Shorter extensions will obviously cause less issues, as will using a better, or even a HD magazine tube spring. I recommend and use Nordic Components tubes, nuts and springs. There HD spring is good for about 1000 rounds in a 7-8 round capacity. Their standard spring is good for about 1500 rounds, but it is not as strong.

jmr40 · October 15, 2016, 09:43 AM

Not specific to the 930, but I've tried extension tubes on other guns and decided they weren't worth the negatives. You can get another 2-3 shells in the magazine, but it adds a considerable amount of weight and at a place where it negatively effects balance. If I felt the 4+1 with a standard tube wasn't enough an ammo carrier on the butt stock works better for me. Not quite as much weight and you typically can carry 5-6 more shells. But the biggest difference is where the weight is located.

Bushmaster1313 · October 19, 2016, 09:27 PM

If you extend your magazine too far on a New Jersey semi-auto shotgun you become a felon

I might be mistaken, but a standard 7+1 SPX might already be too many.

Also, it might be a felony to have a pistol grip full stock semi-auto New Jersey shotgun

dreaming · October 20, 2016, 02:08 PM

Any defect where the extension interfaces with the magazine can cause problems with loading the tube as well as feeding

jreXD9 · October 24, 2016, 07:46 PM

glad I'm not in Jersey!

October 11, 2016, 09:15 PM	#1
jreXD9 Senior Member Join Date: November 11, 2009 Posts: 404	Tube extension for 930 SPX--Your experiences? I'm thinking of adding a +2 or +3 or +4 tube extension to my 930 SPX. Has anyone else done that? What's the main issue to look out for? What brand did you buy? I miss the 8+1 capacity of the 590 I had. __________________ Don't go ninjin' nobody don't need ninjin'.

October 14, 2016, 07:58 PM	#2
jreXD9 Senior Member Join Date: November 11, 2009 Posts: 404	dang.....nobody? __________________ Don't go ninjin' nobody don't need ninjin'.

October 15, 2016, 09:05 AM	#3
MarkCO Senior Member Join Date: October 21, 1998 Location: Colorado, USA Posts: 4,308	When you add length to the magazine tube of the 930, that is where a good portion of the malfunctions originate. Shell surge is a thing and since the 930 does not release the next shell on the trigger pull, but while in recoil...not a good combination and well outside of the engineered operating window. Shorter extensions will obviously cause less issues, as will using a better, or even a HD magazine tube spring. I recommend and use Nordic Components tubes, nuts and springs. There HD spring is good for about 1000 rounds in a 7-8 round capacity. Their standard spring is good for about 1500 rounds, but it is not as strong. __________________ Good Shooting, MarkCO www.CarbonArms.us

October 24, 2016, 07:46 PM	#7
jreXD9 Senior Member Join Date: November 11, 2009 Posts: 404	glad I'm not in Jersey! __________________ Don't go ninjin' nobody don't need ninjin'.

October 15, 2016, 09:43 AM	#4
jmr40 Senior Member Join Date: June 15, 2008 Location: Georgia Posts: 10,809	Not specific to the 930, but I've tried extension tubes on other guns and decided they weren't worth the negatives. You can get another 2-3 shells in the magazine, but it adds a considerable amount of weight and at a place where it negatively effects balance. If I felt the 4+1 with a standard tube wasn't enough an ammo carrier on the butt stock works better for me. Not quite as much weight and you typically can carry 5-6 more shells. But the biggest difference is where the weight is located.

October 19, 2016, 09:27 PM	#5
Bushmaster1313 Senior Member Join Date: November 22, 2008 Posts: 339	If you extend your magazine too far on a New Jersey semi-auto shotgun you become a felon I might be mistaken, but a standard 7+1 SPX might already be too many. Also, it might be a felony to have a pistol grip full stock semi-auto New Jersey shotgun

October 20, 2016, 02:08 PM	#6
dreaming Senior Member Join Date: October 19, 2016 Posts: 186	Any defect where the extension interfaces with the magazine can cause problems with loading the tube as well as feeding