The third, "FR" Fulton Recovery is a blue-painted version which is stated to fire a round "filled with sleep gas and Fulton Recovery Balloons" ( Peace Walker is not the most sensible of games) which allows soldiers to be kidnapped from places the player character.
"Aerial Mine" A fictional weapon using "Fulton Technology" (ie magic this mine floats to a specific height and then hovers there; helicopters and the Chrysalis AI Weapon will take serious damage if they strike.
Given that barrel length seems to have almost nothing to do with accuracy in Peace Walker, it can be surmised that the ultimate sniper rifle would be a Derringer with a scope.
This is the only practical way to S-rank some of the harder helicopter battles since they will have more escorting troops than the player is able to Fulton.Rank 5 MG3; note the new belt box.Ptrs-41 anti-tank rifle -.5x114mm ptrs-41 on the R D menu.Augmenting tools requires research at level 22: augmented hatchets, pickaxes, and/or the fishing rod-o-matic.M21 Sniper Rifle -.62x51mm nato Rank 3 M21 on the R D menu.The experience gained from siphoning an item is the same as from disassembling it two levels lower.Rank 2 and 3 use the same model.The spring cleaner and/or Pack yak with Winter storage scrolls are recommended to deal with the frequent rune drops.M47 Dragon - 140mm M47 Dragon on the R D menu.This requires approximately one weapon set, body armour, leg armour, 3 augmentors (4 if using dual-wielding 67 equipment siphons, and 278 divine charges.As with the M1C, a second variant can be developed which is only useful in co-op play by finding a Rank 3 blueprint; this version fires rounds which heal the target rather than recover their stamina, and features a limited-durability suppressor.Smith Wesson Model 19 The Smith Wesson Model 19 is the game's only revolver, and is first unlocked as a Rank 3 blueprint awarded for completing one of the Fulton Recovery missions.These are rather anachronistic, given the Harpoon did not enter service until 1977.Pre-release images show an R D image of the Mk 22 Mod 0 with the suppressor detached, which is not possible in the R D menu in the final game.Another fast method of combat based invention training is using ancient magicks on Muspah at Freneskae.Kampfpistole Z -.65mm R D image of the Kampfpistole.
Colt Model 653 -.56x45mm nato Rank 5 Model 653 with suppressor and M203 on the R D menu.
Airsoft Ithaca 37 with sawed-off stock and barrel - (fake) 12 gauge Ithaca 37 with extended magazine tube - 12 gauge R D image of the basic sawed-off Rank 2 version.