What's the rumour about bayo's and not shooting....

The exiting gasses have an effect on POI of the bullet. Mosin M44's are a good example of this as they were zeroed with the bayo extended. Generally POI will be off quite a but when shooting with it folded with these. The one I had would shoot dead on with it out, and 6 inchs right with it folded.
 
Depends on the rifle, but the original M-16 barrels were so light they'd actually bend a wee bit with the bayonet attached. If the bayonet is attache directly to the barrel it will alter the POI a bit. You're adding a couple of pounds to the end of the barrel.
 
Attaching anything to the end of a barrel changes it's harmonics and hence its POI. Sometimes the changes are predictable sometimes not. Most WWII era rifles had a battle sight that was to be used with bayonet fixed. The long range sights were not. I spent alot of time fooling around with my No4 trying to get them both the same until I read one of the old manuals.
 
Kampfhamster said:
Point of impact definately changes a bit.

We tried it out on the 300m range with the PE90. My rifle shot rather high with bajo attached.
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Course if you were at a point where you would be 'fixing bayonets', you would be a hell of a lot closer than 300m and a few inches off your original zero wouldn't make a bit of difference anyhow would it??? Hardly need surgical precision rifle fire at ranges where you would be using a bayonet anyhow.
 
Any point of contact on a barrel will effect it in some manner.

The actual science behind it dealts with frequency wave pattern from blast etc.

The issue with the bayonet in it it will alter pressure on the barrel - not just aditional weight - but also two or sometimes more points of contact onto the barrel - this alone will alter the POA/POI - however since most bayonets also hang out and defelect or otherwise impeed the expanding gasses and sound waves, it will have a small effect on the bullet as it leave the barrel (IMHO not worth mentioning in high velocity firearms).

The problem is the points of contact and how the barrel will 'whip' is altered by the weight and points of contact. In some weapons that have precise beyonet fittings that lock solidly there is predicable shift that can be allowed for - in others it is a WAG as to where the effect on this attachment will send the bullet.
 
Norcyaddict762 said:
what causes the desired effect with the bayonets? Can anyone explain the physics of this :?:
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Huh?? what desired effect? To me if a bayonet attached to a rifle causes disruptance to the 'harmonics' of my rifle and affects the POI of the round, why would that be a desired effect??????///

OTOH, if you mean, what cases the desired effects of the bayonet as it is intended to be used i.e. when stabbing the enemy whilst attached to the rifle, I would say the shape and strength of the blade in conjunction with the force exerted upon the bayonet in a forward motion is what causes this effect....
 
I think the expanding gasses are travelling faster than the bullet at the point where it leaves the muzzle and have an effect on POI. For example, when I switched from my A2 hider that indexes the vents on the top, to a phantom that distributes gas equally, my POI was almost a foot low at 100m........
 
Flash Hiders and their torque - as well as the contrenticity of the bore to the flash hider and how it was machined can also affect zero / group size.
 
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