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Posted: 3/6/2010 12:12:08 PM EDT
Here is a pic of my bayo adapeter. I have seen this type with the bead site on pictures of Airforce M870's with a 20" barrels.
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How does it actually attach to the end of the original mag tube? Just slide on then tighten down the clamp on the top edge of the barrel?? or does it also act as a mag extension?
| its hard to see in my pic but the tube is totally separate piece. it is also a magazine extension. remove the original magazine tube nut and screw the extension on. slide over the lower bayonet mount piece and then put on the top saddle part. 3 screws hold everything together. |
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Did it go on as simple as a regular mag extension? It looks like it would be a direct replacement as long as you don't have a front sight that gets in the way. There are two models, the Air Force version has bead front sights, the Marine version is designed to fit around rifle sights. |
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yep it goes on very simple. you do have to remove the original bead sight. a pair of vise grips and 2 seconds. i had an old excerpt from the technical manual for the install that said to put a dab of silicone (i think) over the old sight hole before installing the saddle part. Quoted:
Did it go on as simple as a regular mag extension? It looks like it would be a direct replacement as long as you don't have a front sight that gets in the way. |
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Did it go on as simple as a regular mag extension? It looks like it would be a direct replacement as long as you don't have a front sight that gets in the way. There are two models, the Air Force version has bead front sights, the Marine version is designed to fit around rifle sights. There is probably a good AF vs. USMC joke in there somewhere. Thanks for posting it Machinehead. Interesting stuff. |
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Back in 1987 when I was working as a gunsmith at a local shop, somebody from the Air Force Reserve at Ft. Snelling brought one of those in and had me fix it.
The crimp for the detent ball on the barrel ring needed to be re-staked. I always wondered why they brought it to us, the Army side had an AMSA shop there. 
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I used one of the "Air Force" versions of the 870 at A/1-148IN, Ohio Army National Guard. We had an armory full of them. Being the OANG can/could be used in civil matters, as every other state guard, we maintained 120'ish shotguns and 120'ish M-16's for every man. I cannot remeber the text exactly, but the OANG's 870's were factory engraved to denote the State of Ohio's ownership. ETA: All of the 148th IN has them too. So that is Companies A, B, C, D, E, plus HHC and Regiment. So that "rare" part is out there in quantity... |
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This type was also used by the Marine Corps,
In the '83-'86 time frame these were what we received when we ordered the Bayonet adapter parts and mag extensions when I was working in the IW shop 2nd FSSG. IIRC, the earlier rifle sighted versions either had a ramp front sight attached directly to the barrel (no mag ext) or too the top of the adapter (w/ mag ext). Both of these versions had the rear sight attached directly to the barrel. At the time, there was a message out to remove the rear and front sights from their ramps and utilize them as-is. When they came into our shop, we replaced the barrels with unsighted ones and ordered the mounting brackets as shown by the OP. Wpns Man |
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*snip*...to remove the rear and front sights from their ramps and utilize them as-is...*snip* Wpns Man Guess that would explain this fellow's lack of sights... http://mauser98.com/12-gauge-dvic519.jpg Yes i have that pic saved also. This guy USMC or Navy Seal.. Notice the Sage international telescoping stock. I wish i saved up and bought that instead of the Mesa Tactical. Also you notice that the 20" USMC barrel and extension tube extend past the bayonet mount assy? I put on the Bayo adapter on a 18.5 " barrel with a 2 round Remington extension. Well things did not totally line up together right. The center mount screw is a little offset, probably to pass under the indentation in the Magazine extension. I think it would line up for the three round mag extension tube , which would also protrude past the front of the barrel. I geuss what I am getting at, is the Airforce model have a 3 round extension with a 18.5" barrel? |
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Roger,
Given the high and tight, flight suit and the fact that he looks to be on an LPD I would assume he is probably a member of a FAST company. Though by the time the FAST Co's came into existence the 870's in the system "should" have been converted using the bead sighted adapters. Wpns Man |
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*snip*...to remove the rear and front sights from their ramps and utilize them as-is...*snip* Wpns Man Guess that would explain this fellow's lack of sights... http://mauser98.com/12-gauge-dvic519.jpg Yes i have that pic saved also. This guy USMC or Navy Seal.. Notice the Sage international telescoping stock. I wish i saved up and bought that instead of the Mesa Tactical. Also you notice that the 20" USMC barrel and extension tube extend past the bayonet mount assy? I put on the Bayo adapter on a 18.5 " barrel with a 2 round Remington extension. Well things did not totally line up together right. The center mount screw is a little offset, probably to pass under the indentation in the Magazine extension. I think it would line up for the three round mag extension tube , which would also protrude past the front of the barrel. I geuss what I am getting at, is the Airforce model have a 3 round extension with a 18.5" barrel? The Air Force model with bead sight uses a 20" barrel. The original USMC Mk1's used a 21" barrel, as shown in that pic with the Sage stock. EDIT: All of them use the 3-rnd extension |
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*snip*...to remove the rear and front sights from their ramps and utilize them as-is...*snip* Wpns Man Guess that would explain this fellow's lack of sights... http://mauser98.com/12-gauge-dvic519.jpg That is exactly what my bayonet adapter looks like. Beat up and missing the sight blade, but has the ramp. You all should be careful about these too. While Remington made some with bead instead of sight ramp, there are some out there (I have one) that are close copies, but NOT USGI or even American I suspect. These will have a bead sight, cheaper thinner construction with less built-in reinforcements, and the middle screw position is offset like those on the originals, but not offset enough to REQUIRE the use of the Remington mag tube extension. Thus, it does not stay put very well during spirited bayonet drills! I bought that non-USGI version from some guy on ebay in France. It might be, maybe, French military since he seemed to have a lot to sell back then with a buy-it-now. But I would actually expect better quality even from the French. But on the shotguns they used it on (maybe) it might have been fine. |
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