Saturday Whatsit

Here at TFB, we were doing a little evaluating this weekend, and had a lot of interesting gun parts laying around the shop, so I thought “why not have a little fun?” So, below is an image of a rifle part, and I am tasking you, our readers, with guessing what it is and what weapon it comes from!

Ready? Set? Go!

We’ll give you the answer next week!

Nathaniel F

Nathaniel is a history enthusiast and firearms hobbyist whose primary interest lies in military small arms technological developments beginning with the smokeless powder era. In addition to contributing to The Firearm Blog, he runs 196,800 Revolutions Per Minute, a blog devoted to modern small arms design and theory. He is also the author of the original web serial Heartblood, which is being updated and edited regularly. He can be reached via email at


  • Jeff Smith

    Is that the bolt from an FN SCAR?

    • James

      Close, but no; the SCAR has a two-part bolt, this is a single part bolt. But other than that the two are almost identical, since this is an AR-180 bolt, which the SCAR draws many design cues from.

      • M

        AR-180 bolus have a cam pin home, this does not

        • M

          Ar-180 bolts have a cam pin hole. This does not

          • MR

            MPAR bolt. IDK, but it looks like there’s something just out of view around the upper side of the bolt. Perhaps the cam pin only goes through one side, to prevent the bolt from being installed upside down?

          • Mpar bolts are triangular 😉

  • DW

    Bolt from G36?

  • Some Guy

    Bolt from an AR18

  • Am I disqualified?

    • DW


      • Dan

        Well that depends do we really want to wait until next week for the answer?

    • WHAT!!! Yes you are most definitely disqualified—LOL!

  • Carl

    Toy from a Robot’s Mcdonalds happy meal?

    • TVOrZ6dw

      Nice. Next month will be a bolt-carrier.
      We need you to run for president. 🙂

      • TonysTake

        Well, whatever it is, obama will want it banned!

    • Ace Dragon


  • Yimmy

    Ar180 bolt

    • Steve

      Doesn’t the AR-180 bolt have a hole for a cam-pin?

      • BrandonAKsALot

        Looks like the lever thing on it would probably be used to cam maybe via slot in the carrier like the AK.

  • PK

    You ought to have substantially more unusual parts for this. I’ll have to take some photos and send them in for you… I have things that are exceptionally odd laying around my shop.

  • Will P.

    Either a bolt for a Bushmaster ACR or an AR-18?

  • BrandonAKsALot

    Whatever it is, it doesn’t use a cam pin. I’ve run through every AR style bolt I can think of and can’t seem to find this design.

    • M

      Glad I wasn’t the only one that noticed that

  • Tyler

    Aug, sa80, early bushmaster pre AR rifle. Early colt piston rifle..

  • Jeremy r

    Bushmaster m17 bolt

  • SnakeEater-0317

    Flame-throwing, laser beam, gauss shotgun. Possibly from some sort of weird Colt product pre-1980, that actually worked.

    From examining the photo, and the notches on the front end, it most likely feeds from some sort of high-capacity, high-velocity assault clip.

    Most likely made in a garage with tools from Home Depot.

    Attachments would’ve most likely included, bayonet-grenade launcher-suppressor mount, a shoulder thing that goes up, and a semi-fully-automatic two position on button.

    • MR

      It’s how you keep idiots busy. 😉

  • mechamaster

    Howa Type 89 ( Japan ) ?

  • iksnilol

    Ar-18 bolt? I promise, I didn’t look at the comments. It’s just what I thought it looked like.

  • Micki

    Johnson m1941 bolt?

    • Scott Connors

      This is my guess as well.

      • Micki

        Hognose over at weaposman says “no”, unfortunately, and I bow to his superior knowledge. I hope it’s not some dreary piston-driven AR, though.

        • ostiariusalpha

          No gas rings say a piston is likely.

    • ostiariusalpha

      Not even close.

      • Micki

        I think that pic shows the assembled bolt group, (i.e. the two parts of the bolt together), rather than the bolt on its own. But yeah, you’re right, it’s not a Johnson.

  • Clint J.

    Shoulder thingy that goes up?

    • MAX

      And hey???

  • Joshua

    AUG bolt.

  • me ohmy

    stoner variant….I imaged searched and tried all I knew.. good stump..I’m stumped other then a basic ARMALITE/STONER pattern.

  • Alt Jensen

    That looks like a 30 caliber clip to me.

    • MAX


    • Blake

      …high-speed version…

  • Gjert Klakeg Mulen

    That is an evil automatic assault rifle with clips that holds multiple round that automaticly kills every human it sees.

  • Scott Wilkerson

    Howa Type 89, as Mechamster says.

    • ostiariusalpha

      The Type 89’s cam pin hole goes all the way through the bolt.

      • Scott Wilkerson

        Didn’t see that. Argh!

  • John

    I believe that is from the Australapithicus Hammerflaven. They are know to frequent the lowland mountain regions of Kansas and eat a steady diet of ball ammunition with the occasional hollowpoint for fiber.

  • Riot

    A Daewoo K2 bolt.

  • Scott Wilkerson

    Colt 703 bolt

    • MAX

      Looks really close

      • Joshua

        No way they have a 703 bolt. The only remaining rifles are in museums and in Reed Knights collection.

        • MAX

          yes Bro hahaha “Looks really close”

        • What if I paid Reed a visit? 😉

          • Joshua

            Then I shall bow before your Majesty.

          • I didn’t, hahah. 😉

      • DIR911911 .

        you’re not playing the game right, please check other player’s responses and adjust accordingly 🙂

  • TheNotoriousIUD

    One a them finned exploding shotgun shells.

  • Twilight sparkle

    The bolt from a k1 maybe?
    I mean it looks like something inspired by stoners bolt

    • Nick

      I like the game, but it would be better with a part that does not have such an obvious use.

      Like the one below.

      • Mark Hartman

        M96 expeditionary rifle bolt.

      • iksnilol

        Is the case related?

    • ostiariusalpha

      The K1 is a Stoner internal piston design, it looks pretty much the same as a normal AR-15 bolt.

  • Hammer Forged

    Early HKM4 prototype ?

  • jimmy james

    Its the top part of a machanical pen… Click open, click closed…you know.

  • Ace Dragon


  • Zach

    PWS bolt from long stroke pws rifle.

  • Arashi

    Bushmaster (Gwinn) Arm pistol bolt

  • Fred Garvin

    Is it a bolt from an Imbel IA2?

    • ostiariusalpha

      Lots of piston operated guns use very similar bolt designs to the Colt 703. The IA2 is among their number, but this mystery bolt lacks the cam pin hole.

      An IA2 bolt:

  • Austin Lebo

    looks a lot like a bolt for an arak 21 5.56 or .300blk but with a slightly wider shank could it be a bolt for the arak 31 in .308?

    • me ohmy

      nope….not even close..lightly modded ar bolt. try again, this one is hard

  • Daniel Aviles

    DPMS .308 Gen II?

  • Arashi

    Robarm M96 Expeditionary rifle bolt.

  • Limousine Liberal

    That is a gear from a 1950’s vintage vibrator. I found one of those in my grandmother’s drawer decades ago.

  • me ohmy

    naw… the HOWA still uses a cam pin and has the hole crossways through the rear of the bolt body

  • MAX

    Not a Daewoo. I thought that 1st. This is a Daewoo Korean gangster film thought.

  • MAX

    Look at the end of the bolt with the larger diameter CIRCUMFERENCE (riding area) And then the position of the hole??? Mama MIA!! What is hiding??

  • greekpreparedness

    There SHOULD be a cam pin hole on the bolt. Else how would it rotate? Assuming that the camera angle hides it, we then should hunt for another telltale sign, the slots on the base of the extractor socket. (also extractor length and pin position).

  • jerry young

    AR bolt locking lug

  • palehorse58

    Is it a corn cob holder???

  • MVB

    Colt CMMG 2 or 3

  • Wetcoaster

    One of the Taiwanese rifles? T86? T91?

  • Cattoo

    It is the spoon handle hinge pin assembly on a semi automatic laser sighted hand grenade. Sheesh…everybody knows that.

  • CZFan

    Bolt For piston AR

  • BlueInfantry

    It is a key for the hydrostatic lock for the diesel engine in an M113A1 APC. I’m sure of it. 🙂

  • M.Mitchell Marmel

    It’s a cracked left-handed veeblefetzer with a belt in the back!

    That, or a flux capacitor. Or maybe an Oscillation Overthruster.

  • Bill

    How is it that she is holding an UZI and she doesn’t just start shooting people? Isn’t that what happens when you pick up one of those deadly assault gun weapons that hold dozens of bullets in their magazine clips? The horror!

  • p89ruger9mm

    Sig 556 , bolt

  • tenmillimeter

    Desert Eagle bolt.

  • timothius

    Bolt w/ extractor.

  • Glenn Schantz

    It’s an AK bolt.

  • Core

    AR18 or ARX8 🙂

    • Core

      I would say M96 but the chrome plating and ring around the aft end suggests otherwise. I’m guessing because it appears to be new it’s the ARX8 the child of G36 which hails from the AR18…

  • Sam Green

    That part is an early bolt that Eugene Stoner himself fabricated after drinking a quart of bourbon; right after he hit the bar when the military told him to get real, no plastic guns for Uncle Sam.
    So he got drunk, made the prototype M16 bolt while drunk as a skunk, and the rest is history.

  • Lt_Scrounge

    It’s some form of bolt for an AR-15 or similar type of firearm. It has the same locking lug and extractor as an AR bolt but it doesn’t have the same dimensions towards the rear. It seems to use a different means to retain the firing pin retaining pin as well.

  • Sam Manda

    M$P core trigger group duh!!!

  • The Brigadier

    Its a rifle bolt. .