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Try running it without the retainer and see what happens. I ran a Nova that way with no issues.

Does it still add two extra rounds? If the mag spring retainter is falling out of the tube, take some snap ring pliers and stretch it so it is a snug fit. Edit: Sorry, I just saw that it is NOT an extention.

3" Magnums? That could get spendy. All you need to do is get the bolt dripping wet with the lube that came with the gun and shoot a whole 100rd value pack of federal birdshot that you can get at walmart and you will be good to go.

Too small for QD sling mounts. At least the ones I have . . .

I replaced the o-rings on one my M4s that I have had for about 5 years. They were getting torn/worn from repeated removal, not normal operation. I think unscrewing the plugs wears them more than anything. Brownells sells replacements but they appear to be out of stock and ever increasing in price even though they are relatively cheap: http://www.brownells.com/shotgun-parts/receiver-action-parts/o-rings/gas-plug-o-ring-sku301000497-23649-50266.aspx

I run this http://www.spectergear.com/ProductDetails.asp?ProductCode=292

After owning a few of these, one thing I have learned is to break them in with the oil that is in the box with the gun. It will run happy on birdshot with that stuff.

The adjustability of the cheekpiece looks good. I would have preferred a factory-appearing grip though.

I like the KZ "ergonomic" oversized handle. Been running one for a while with no issues at all. http://www.botachtactical.com/kzbeerchha.html

Yes it is normal. Especially around the ejection port. It gives it character imho. These things are made to be used hard.

Try Wolf Slugs. The wad is attached to the slug and they are scary accurate.

Wow. The grip and cheekpiece look like factory parts . . .

I don't know about carrying $50,000 in inventory but I have heard from a few local dealers that a minimum order with Benelli is $10,000.

They can be very tight. Do they appear to be cross threaded? If not try to get some leverage/an extension while using to the bolt handle to turn them.

M4s need to be tight in the shoulder when firing birdshot and low recoil loads in my experience after owning a few. They also like to be ran wet with the lube included from benelli when breaking them in.

Looks fun. I think there are some members on the forum here that have said they have "outrun" the gun and caused trigger issues because the action could not keep up.

I am down to 2 at the moment. I want to pick up a sbs M4 sometime . . .

I think tktm might be on to something. If the handguards didn't allow the barrel extention to seat properly into the receiver it is conceivable the mag cap wouldn't have enough threads exposed to seat on?? Just a wild guess. Can you post pics of the receiver/barrel interface and the cap?

They are garbage, they only add one extra round.

They will only go up when they pop up on the market. A few years back Botach ($225) and some other online places sold them to anyone. Benelli has since cracked down. Unless you are L.E. you will NOT be able to purchase these new ever again. I suppose if you have an H2O Benelli would sell you a replacement . . . the H2O stock does differ in that the hardware on it is coated so it would be apparent if you put an H2O stock on a regular M4.

I have had a few that look like that also. I wouldn't worry. edit: in fact, my H2O's bolt lugs look like that where the coating has worn away. I also checked a camo version and it looks just likes yours. Happy blasting.

I have had almost every brand of extension. The Freedom Fighter Tactical extension is almost exactly like the Benelli extension. However, it seems like some members here will sell you a Benelli one for less I have a FFT one and yes it can/does get scratched (if you are not careful during disassembly) and reveal shiny metal underneath the finish. I think it adds character.

CZ452 Trainer.

Just load the magazine. To chamber a round when you only have rounds in the mag tube, hit the shell drop lever. Then rack the bolt. If the mag is full and chamber empty, you can also just open up the chamber and drop a round in. That is what makes it "free carrier operation".

I use a Specter Gear 3pt sling with ERB on my M4s. They make one specifically for Benellis. It has a narrow strap on one end that threads through the slot in the collapsible stock (and the pg stock slot also). http://www.spectergear.com/ProductDetails.asp?ProductCode=292 On the front I use a Blue Force Gear adapter (with the factory sling loop turned 90 degrees) with a parachute clip that I thread the Specter Gear sling onto. It clips on and off easily for cleaning or if you want more mobility for a moment. http://www.blueforcegear.com/long-emergency-release-strap-for-fixed-sling-loops/ If Blue Force made a 3pt more readily adaptable to the Benelli M4 I would buy it. I have one of theirs on a rifle and it has extra tough nylon webbing.