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This GB listed 870 Mk.1 is suspect, as has been previously noted by above posts.

Other things that should be noted on this listing:

- Barrel looks to be a bit too long (1/4"-1/2") for the...

Would love to see close-ups of the front and rear sling swivels. Thanks.

Try heating up the area with a [paint remover] heat gun - it won't alter the finish.

Then try tapping the area with a non-marring hammer and punch - might help in loosening the crud the...

A couple of years back, I had the opportunity of shooting the G28 on HK's range in Germany. I accomplished a 10-round, 2.6" group at 200 meters, which I found impressive for a semi-auto rifle.
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And, it has the wrong rear sling swivel. Additionally, the stock is in new condition - like the ones that show up on eBay every now and then - sure doesn't match up with the pitted receiver and faded...

Yes, you were right on! It was a very nice '97.

This shotgun just sold for $7,001.00!!

http://www.gunbroker.com/Auction/ViewItem.aspx?Item=551851248

Reference Listing: http://www.gunsamerica.com/963988248...h-Gun-WWII.htm (WWII Trench Gun), the Heat Shield/Bayonet Adaptor is a late 1960's-early 1970's Stevens Heat Shield Assembly purportedly made...

There are numerous things wrong with this "USMC M870 Mk.1" - some have already been point out, but to add to it:

•While it's a 1970's manufactured receiver, the serial number is way above the...

The eBay link below has a couple of offerings - one vintage, and one current. The vintage one is early Remington 1-piece model. It's complete and in good shape, but asking price is pretty steep -...

You should have a look at the book that started it all on military shotguns:

"The World's Fighting Shotguns", by Thomas F. Swearengen (Chief Warrant Officer, U.S. Marine Corps, Ret.), 1978,...

They show up from time-to-time on eBay - search for "Vintage Sling Swivel".

If you are referring to the type of swivel used on the USMC 870 Mk.1 or USN/USAF M870, as well as some police riot 870's ordered with sling swivels from the factory (circa 1960's-1970's), it is the...

You may want to check out the Hi-Lux Leatherwood website:

http://hi-luxoptics.com/product/riflescopes/malcolm-replica-scope-series/malcolm-8x-usmc-sniper/

It's made in China and around $550.00,...

It all depends on what "pigments" are added to the chemical bath, whether anodizing or phosphating, that gives the black, grey, or grey/green colour.

Apparently, from what some military firearm...

Metal is "parkerized", aka: phosphating.

Aluminum is "anodized", i.e., the M16/M4 upper and lower receivers. It's an industrial chemical process impregnated into the aluminum - it's not a spray-on...

Bead Diameter for the Two-Piece Bayonet Adaptor Sleeve: 0.150". Dull silver/grey in colour, and made of steel.. This type are still fairly common and have a #3-56 TPI.

Location of Bead on...

I thrust the following info will be of use to you or someone else down the road:

There are actually three (3) different screw lengths used for the "Mk.1" type One-Piece and Two-Piece Clamping...

Just to clarify, I was talking about if there is a hole for a Bead Sight in the Adaptor Sleeve (under the Ramp Base) - not the Barrel.

On the outside, the Adaptor Sleeve looks pretty good, but are there close-up photos of the Sight Base?

If you are able to remove the Adaptor Sleeve and look inside near the front of it, there...

To reinforce what "scosgt" is cautioning, have a look at the attached 2013 auction listing where a fake USMC 870 sold for nearly $9,800.00!
...

Any photos available??

According to Canfield's "U.S. Military Combat Shotguns" book, (Collector Notes, page 193), your serial number appears to be within the USMC Model 870 Mark I serial number...

Pictures will help.

Sorry...meant "stamped" serial number.

Thanks for the info.

"scosgt"...thanks for the reply.

I don't know if you read my "Pt.1" of this thread, where I detailed info to indicate it would not be a military shotgun - which obviously it is not.

There is...