Most bayonets have two things in common, a ring (circle) on the handle at the base of the blade (it fits over the barrel) and a latch of clip that fastens to the bayonet stud and secures the bayonet onto the rifle.
Go to: Jouster.com look under knifes and bayonets
Either take it to a weapons appraisor or compare it to a weapons collector book
You will need to be able to identify the makers mark and style in comparison to (known) authentic pieces
To find out what gun a bayonet is for, you should get on wikianswers.com and type in the info of the bayonet.
Depends which type. The Chinese Type 56 used a similar permanently fixed bayonet, but the SKS bayonet couldn't be mounted on an AK variant which uses a detachable bayonet.
The spike bayonet is a little more efficient at penetrating, but neither one impacts the quality of the rifle itself. The only SKS variants you'll find the spike bayonet on are the Chinese Type 56 carbine and the rather uncommon Albanian variant.
bayonet
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Muskets, with a bayonet at the end.
Bayonet Versus Bayonet - 1897 was released on: USA: December 1897
If your asking about a Yugoslavian SKS 7.62 x 39, then these are some things to help identify one. All Yugo's have a grenade launcher on the end of the barrel just after the sight. They also have a blade-type bayonet unlike the Chinese which have a spike-type bayonet. Don't go by just the bayonet though because the Russian SKS has a blade-type bayonet also. Also, in between the sight and the gas tube on the top of the gun, they have a flip-up sight for the grenade-launcher. Hope this helps.
ST connectors
the top 'bayonet' appears to be ww2 Japanese rifle bayonet the bottom 'bayonet' appears to be an early US 1903 bayonet or british bayonet. message me with writting on bottom bayonet, on blade near top of hilt.........
Non if the light fitting is of the bayonet type.
A soldier keeps his bayonet in his frog