Benelli M4 Wolff Magazine Spring

Failure to feed on a Benelli M4 tends to show up at three different points — a fresh gun that isn't broken in yet, a tube just pushed from 5 to 7 rounds, or an OEM spring that's finally worn out. This spring covers all three.

KEY FEATURE & BENEFITS:

• Purpose-built for 7-round Benelli M4 magazine tubes
  
• Extra power gives margin during break-in period, when parts are still stiff and unworn.
  
• Compensates for the longer shell column and added friction of extending capacity from 5 to 7 rounds
  
• Holds correct compression longer than the OEM spring, which loses power with age and eventually stops feeding reliably
  
• Shorter solid length than OEM (2.01" vs. 2.11") frees up extra internal tube room
  
• Made in the USA by Wolff Gunsprings — 70+ years of firearm spring experience
• Lifetime warranty

PRODUCT DESCRIPTION:

Failure to feed on a Benelli M4 almost always traces back to one of three moments, and the OEM spring is the weak link at all three. The first is a brand-new gun — a fresh action hasn't broken in yet, and that extra internal friction can be enough for the factory spring to come up just short on shell presentation. The second is right after extending magazine capacity from 5 to 7 rounds — pushing a longer column of shells reliably asks for a little extra power. The third is the classic wear case: even on a broken-in gun at stock capacity, the OEM spring loses power over years of use and eventually stops feeding the way it used to.

Wolff's high-power spring is built to cover all three. It's intentionally a bit stronger than needed when new, giving it margin during break-in and right after a capacity increase, and it holds that tension longer than the factory spring.

FULL SPECIFICATIONS & INSTALLATION:

Solid (compressed) length: approximately 2.01" vs. approximately 2.11" for the OEM spring — about 1/10" of extra usable tube space.

For maximum internal clearance, pair with the Max Room Follower for an additional ~1/8" of space and the Titanium Mag Cap for an extra ~1/2" of room on top of the spring's savings. 

Construction: closed and squared ends prevent follower binding; high-carbon spring steel, made in the USA.

Available as a single spring or a 4-pack.

COMPATIBILITY:

Optimized for 7-round Benelli M4 tubes; also works in 5-round tubes and most 12-gauge clones holding 5–7 rounds.

Cover all three failure points at once — add the Wolff Spring to your order.