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M3 Grease Gun Build
Weaponeer Forums : M3/M3A1 Grease Gun

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  HARTSGUNS

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Posted: March 18 2015 at 9:13pm | IP Logged Quote HARTSGUNS

Has any one on here built an M3? I have a parts kit I am looking to build. It will be a full auto post 86 dealer sample, as i am licensed to do so. any help or info would be great. looking for receiver stampings, or receiver scraps.
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  Pvozzo

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Posted: March 22 2016 at 2:40pm | IP Logged Quote Pvozzo

Similar question - has anyone built an M3A1 parts kit into a legal, semi-auto firing from a closed bolt?   thought: would the Indianapolis Ordnance 9mm MP40 semi-auto bolt be convertible for a tube welded up to a grease gun parts kit and firing .45 ACP ?
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  backbencher

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Posted: March 23 2016 at 10:09pm | IP Logged Quote backbencher

Yes, they have been built. A 9x19mm MP40 bolt might be too light for the .45" ACP.
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  justin22885

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Posted: March 24 2016 at 1:52am | IP Logged Quote justin22885

starting with a tube and then welding on your magazine and trigger housing is probably the best, and maybe even the only way to go at this point, im unaware of anything selling complete stampings for it which i believe included all these features in two stamped halves welded together
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  Pvozzo

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Posted: March 24 2016 at 7:36am | IP Logged Quote Pvozzo

Backbencher - yes, I have considered that the 9mm bolt might be too light - I wonder how I might add mass?

Justin22885 - agreed that no one is ever going to make stampings again - a tube is the apparent solution. I'm considering two tubes - A FIRST for the exterior housing, and a SECOND as something like an Indianapolis Ordnance tube with one of their 9mm semi-auto bolts all mounted inside the first tube (I've checked and it fits). They also sell magazine adapters for the Sten magazine to fit into a .45 mag housing, as well as a 9mm barrel for the M3A1.
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  backbencher

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Posted: March 24 2016 at 2:16pm | IP Logged Quote backbencher

Pvozzo wrote:
Backbencher - yes, I have considered that the 9mm bolt might be too light - I wonder how I might add mass?


Drill holes, pour in molten lead?
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  justin22885

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Posted: March 24 2016 at 2:41pm | IP Logged Quote justin22885

dont use lead... if you want to add weight, drill holes and use a press to press in tungsten bars.. you can get round bars of tungsten fairly cheap, drill a hole the appropriate size, press them in and it'll add more weight than lead would and isnt going to soften from heat

and pvozzo, if youre wanting to make a "pseudo" M3A1 build using non M3 parts, use the PPS-43 bolt and cut a 45acp bolt face
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  Pvozzo

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Posted: March 24 2016 at 5:47pm | IP Logged Quote Pvozzo

yes - tungsten has roughly twice the mass as steel - - that would be a good idea
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  Pvozzo

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Posted: March 24 2016 at 5:50pm | IP Logged Quote Pvozzo

Here is my project, as I see it right now - and I wish I could find someone who has done or understands what I want to do well enough to assist:

M3A1 parts kit project
-           ;Reconstruct the M3A1 receiver housing using a tube from Cold Steel Solutions
-           ;Remove (cut) from original:
o   Grip assembly
o   Barrel trunion
o   Magazine housing
-           ;Purchase replacement:
o   Sling loops
o   Ejection port cover hinge & spring
o   Stock brackets
o   Rear sight & insert
-           ;Re-attach above by welding to new tube (exterior housing)

Alternative one (.45 ACP):         & nbsp; 
-           ;Use an Indianapolis Ordnance receiver tune and 9mm, MP40 semi-auto bolt arrangement
-           ;enlarge the space in the face of the bolt that seats the cartridge to accept a .45 ACP cartridge
-           ;install the smaller receiver tube inside the M3A1 housing
-           ;modify the trigger and/or receiver tube for use
-           ;modify the magazine well to further extend up to new, smaller diameter receiver tube

Alternative two (9mm):
-           ;Use an Indianapolis Ordnance receiver tune and 9mm, MP40 semi-auto bolt arrangement
-           ;install the smaller receiver tube inside the M3A1 housing
-           ;modify the trigger and/or receiver tube for use
-           ;modify the magazine well to accept Sten mag’s, and further extend up to more narrow receiver tube
-           ;buy a 9mm M3A1 barrel from Indianapolis Ordnance

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  justin22885

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Posted: March 25 2016 at 12:21am | IP Logged Quote justin22885

pvozzo, why not start your own thread then, instead of hijacking HARTSGUNS'?
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  backbencher

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Posted: March 25 2016 at 12:47am | IP Logged Quote backbencher

Meh, OP hasn't posted in this thread for a year, run w/ it.
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  justin22885

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Posted: March 25 2016 at 1:02am | IP Logged Quote justin22885

aah, youre right, i just noticed that

sounds like pvozzo would just be better off building a franken-build sub gun from scratch.. considering almost every submachine gun of WWII was in many ways all fundamentally the same thing.. excluding a couple odd-balls here and there.. but the sten, grease gun, sterling, KP44, PPS-43, MP40, MP18 and about a dozen or two more are all based on many of the same design details from the MP18
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  Pvozzo

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Posted: March 25 2016 at 7:21am | IP Logged Quote Pvozzo

I appreciate the comments and advise - that is exactly what I am looking for - do tell me if using this forum is the wrong place to ask questions.

My own personal interest in such a gin is as a military collector who does want to fire it - but strictly as a legal, semi-auto that fires from a closed bolt.

So - I already have an M3A1 parts kit with a good grip, mag housing, and barrel trunion. It's been de-milled and is without its receiver housing. That is starting point and my objective.

Pete
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  backbencher

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Posted: March 25 2016 at 8:57am | IP Logged Quote backbencher

Sounds like he is, but wants it to look like an M3A1, which continued in US service into the Gulf War for a few armored units.

IIRC, the M3A1 bolt was heavier than was strictly required for blowback operation, which kept the cyclic rate low.
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  justin22885

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Posted: March 25 2016 at 11:02am | IP Logged Quote justin22885

the muzzle climb of 45acp in such a compact weapon would have made it uncontrollable at the ~600rpm of most automatic weapons, so it makes sense to slow it down to 450... 45acp and x25 have similar bolt mass requirements and the PPS-43 has a cyclic rate of around 600, so adding some tungsten inserts into that bolt to increase its mass, or using a weighed buffer behind it should do the trick

for a semi automatic only though it doesnt really matter
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  weaponeer

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Posted: March 30 2016 at 12:42am | IP Logged Quote weaponeer

backbencher wrote:
Sounds like he is, but wants it to look like an M3A1, which continued in US service into the Gulf War for a few armored units.

IIRC, the M3A1 bolt was heavier than was strictly required for blowback operation, which kept the cyclic rate low.


My Unit had 2 M3A1's for the M88's.  as the Armorer in that unit for around a decade, I always insured that I fired every weapon we had, and that I signed for. The M3/M3A1 SMG had a  nice slow rate of fire, but not near as accurate as the M1928A1, and could be dangerous if you relied on the dust cover "safety" with a magazine in the weapon.
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  weaponeer

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Posted: March 30 2016 at 1:15am | IP Logged Quote weaponeer

Random M3/M3A1 fact.

The "stock" also acted as a magazine loader, as well as a cleaning rod.


Plus, when fitted with a suppressor, it's one of the most silent SMG's.  the only real sound you hear is the sound of the bolt slamming forward.

  1. You can purchase a number of new made M3/M3A1 parts, such as 45acp Barrel with Trunnion
  2. 9mm Barrel with Trunnion
  3. New M3/M3A1 Barrel w/o Trunnion
  4. made Trunnion for the M3 or M3A1 Grease Gun
  5. Guide Rod Retaining Plate (new)
  6. magazine adapter for unmodified 9mm sten magazine to be inserted into the magazine well.
  7. M3 GREASE GUN full auto bolt made in 9mm
  8. M3A1 GREASE GUN full auto bolt made in 9mm
  9. Grease Gun M3 M3A1 Extractor

http://indianapolisordnance.com/other.html

Cold Steel
SEEMLESS TUBING STEEL WITH THE CHARGING HANDLE SLOT CUT
http://www.coldsteelsolutionsincorporated.com/productinfo_v3 .aspx?productid=M3A1GGSTS

https://www.gunpartscorp.com/Manufacturers/USMilitary-33541/ MachineGuns-42384/M3GreaseGun-37216.htm

http://www.ima-usa.com/u-s-m3-m3a1-grease-gun-elite-forces-c arry-bag.html

Now, I have NOT reviewed the ColdSteel M3 Receiver tube, so i cannot make any statements as of quality.  BUT, I would steer Clear From Prexis made products. I would use a
VALKYRIE ARMS receiver or blank if (you could find one), over them. and that's saying a LOT.

Now normally I would suggest a receiver product for the M3 that's been used to build successful M3/M3A1's (semi or C2/SOT). and

VALKYRIE despite their bad reputation had the best looking M3 semi-auto. some worked, some reported to have a problem or two.

http://www.guns.com/2012/12/26/valkyrie-arms-m3a1-grease-gun /

http://smallarmsreview.com/display.article.cfm?idarticles=16 7
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