MP40's Modelguns Forum

International Forum for Modelgun enthusiasts
HomeFAQRegisterLog in

Share | 

 MGC Sterling - Modifing to use MGC Beretta M12S cartridges

View previous topic View next topic Go down 
Cerwyn (Site Admin)
Cerwyn (Site Admin)

Number of posts : 10632
Age : 58
Location / Country : North Wales
Registration date : 2008-07-20

PostSubject: MGC Sterling - Modifing to use MGC Beretta M12S cartridges   Thu Feb 06, 2014 3:03 pm

An unusual modification this, carried out by Japanese enthusiast MrModelgun. MGC's Sterlings were originally designed to use 9mm Open cartridges loaded with paper caps.
Improvements in cartridge design and the introduction of plastic bodied caps provided better performance and as a result the Open cartridge / paper caps became obsolete.

MGCs P220 9mm CP-HW cartridge was found to be a very versatile round, proving suitable for use in several model guns with relatively easy modifications. It has been the cartridge of choice for 9mm model conversions for a long time.

There are problems with the P220 however, being very thin walled screw on tops which are easily crushed or deformed if the gun jams during firing and also the tops' threaded skirt expanding after several uses. This expansion can lead to loss of gas seal and poor feeding from the magazine.

MrModelgun happened to have a large stock of the older MGC M12S CP cartridge so decided to try these in his Sterling. The M12S is nominally 28mm long x 10mm diameter:

P220 cartridges are nominally 26.7mm x 9.15mm diameter:

The M12S screw on top is slightly thicker and stronger making it less prone to damage during firing and jamming (although not ruling it out).

Modifications Reqd:

If your model already uses P220 cartridges then the Chamber will need opening out to fit the wider M12S cartridge


The bolt face is too small in diameter as can be seen here:

and after machining NB Extractor not fitted for clarity:

Only test firing will show if the Detonator Pin needs lengthening slightly.

If, however, you are converting an old Open Cartridge or a non firing Dummy model, you will need a Custom made Det.Pin suitable for CP or CP-HW cartridges


Hobby collector of Replica model guns and Militaria.
also member of Living History Reenactment Groups.
Back to top Go down
View user profile
MGC Sterling - Modifing to use MGC Beretta M12S cartridges
View previous topic View next topic Back to top 
Page 1 of 1
 Similar topics
» SOLD: Kidd Beretta
» WTS Beretta M9 WI SPF
» 99% new Beretta 92 FS 9 mm Police Special edition SOLD SOLD SOLD
» The REAL Scott Sterling...
» Sterling B2B charger

Permissions in this forum:You cannot reply to topics in this forum
MP40's Modelguns Forum :: MGC Modelguns :: MGC Sterling Modelgun-
Jump to: