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OK, here is a pic of a proported FN bolt with the semi-elliptical depressions behind the lugs. I care not the authenticity of the bolts' manufacture but I am curious to learn the name and function of these bolt characteristics.
(Mod: If pic is not in public domain, please delete it.)
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Last edited by catargadelendaest; 08-29-10 at 13:51. Reason: resizing
I have seen Colt bolts with other types of MP markings. I believe some were MPJ and MPY. I would say that some of those are possibly FN and maybe LMT.
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Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com
Owner/Instructor at Semper Paratus Arms
Facebook: https://www.facebook.com/SemperParatusArms/
Semper Paratus Arms AR15 Armorer Course http://www.semperparatusarms.com/cou...-registration/
M4C Misc. Training and Course Announcements- http://www.m4carbine.net/forumdisplay.php?f=141
Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com
Here's my FN bolts, marked MPF - I believe they are legit.
They have the same semi-elliptical cuts.
Feel free to save this image and use it whenever you like. It's the best I could do with a cell phone (I spend my money on guns, not cameras)
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Here's a shot of the F marked extractors:
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Colt bolts marked MP_ or MP__ up to four place stamps.
FN bolts have been MPF with an underscore under one of the letters, usually the F
I have no clue as to the name of the area in question. As far as purpose I would guess that area was trim down to allow more free movement of the bolt inside the carrier causing less jams due to excessive carbon build up.
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