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11/6/2013 4:02:55 PM EDT
I upgraded the M4 by adding a full length factory tube that takes the shotgun from 5 to 7 rounds.  I've read that the factory spring is okay to use with the +2 and I've read that you need a longer spring.  Anyone have a definitive answer?  TIA.
11/6/2013 4:18:14 PM EDT
[#1]
Mine came with a Wolff spring which is quite a bit stiffer than stock.  I would think that stock would be marginal at best; in other words not useable.

Don't forget about 922(r) compliance when changing the mag tube.
11/6/2013 4:20:52 PM EDT
[#2]
Mine came with a new spring as well (Carrier Comp).  Mine is alot more stiff than the OEM/Factory spring.  Who made yours, KILLERB6?

11/6/2013 4:36:49 PM EDT
[#3]
Quote History
Quoted:
Mine came with a new spring as well (Carrier Comp).  Mine is alot more stiff than the OEM/Factory spring.  Who made yours, KILLERB6?

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Freedom Fighter.
11/7/2013 1:02:32 PM EDT
[#4]
Thanks for the replies.  I spoke with a gentleman at Freedom Fighter Tactical today and he assured me that the factory Benelli M4 spring was a 7rd spring.  

ETA - I called FF to order their wolf spring for the M4.  When I told him I was going to a 7rd tube, he told me the factory spring was a 7rd spring.  He took the time to explain this and speak with me; great guy and he certainly earned a customer as my next Benelli upgrades will be going through FF.
11/7/2013 3:50:30 PM EDT
[#5]
Quote History
Quoted:
Thanks for the replies.  I spoke with a gentleman at Freedom Fighter Tactical today and assured me that the factory Benelli M4 spring was a 7rd spring.  

ETA - I called FF to order their wolf spring for the M4.  When I told him I was going to a 7rd tube, he told me the factory spring was a 7rd spring.  He took the time to explain this and speak with me; great guy and he certainly earned a customer as my next Benelli upgrades will be going through FF.
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FF is top notch.  You won't have any issues loving everything you get from them.
11/7/2013 4:45:07 PM EDT
[#6]
I have the freedom fighter titanium full length tube in my m4.  I have the factory spring and it has worked just fine.
11/11/2013 5:04:47 AM EDT
[#7]
I'm thinking about getting an M4 that already has the straight stock, if I change the magazine tube to a 7 rounder what else do I need to do to keep it 922r compliant?
11/11/2013 4:21:32 PM EDT
[#8]
Benelli uses the same spring in the M4 and the M1014. You're fine.
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