[ExSoldier]

HKs are pretty easy, from what I hear. Same with uzi.

My take on this is that any time you start fussing with sears and the like by filing or physically altering the part you risk a runaway gun. Uncontrollable full auto. On a machine gun using disintegrating links the only way to stop such an accident is to twist the belt to force a jam. With a mag fed weapon you'd have to drop the mag or more likely wait the 2 seconds needed to run out of ammo. Unless you're simply dropping in a full auto sear with no mods required I say leave it all alone.

[mamelukesabre]

HKs are modular. The whole trigger group comes off and is replaceable with a select fire version. This is what I was told. They used to have the trigger groups for sale in gun magazines such as shotgun news to anyone, but it is a felony to put one on your rifle unless your rifle was previously registered as a machine gun. I would expect these parts are no longer available without an FFL or class 3. You also used to be able to buy parts to build suppressors too, but if you bought a complete suppressor, you were breaking the law unless you had the proper license. In fact, just possessing a suppressor would get you a felony. But there’s no law against possessing suppressor parts(that I know of). It took the system a long time to catch up to the laws. I imagine they are all caught up by now.

[Repeal The 17th]

“...physically altering the part you risk a runaway gun.”

---

I, uh, heard a story one time, about this feller
that studied and studied and studied
the mechanism of his semi-auto MAK-90
and came to a good understanding of how it all worked
and determined that if he inserted a little shim
in just the right place it would cause it to fire
in full auto instead of semi-auto.
So he did that and then he took the gun down to the
river for a little test firing.
He loaded up a 30 round magazine, and
just pulled the trigger one time and then
he had to hold on until the gun emptied itself.
He says he could have thrown the gun down and
walked away and it wouldn’t have mattered.
Once that first round fired,
it was not going to stop until it ran out of ammo.
That incident scared the heck out of him
and I have it on good authority that
he never tried such a thing ever again.

[supercat]

My take on this is that any time you start fussing with sears and the like by filing or physically altering the part you risk a runaway gun.

On the Daisy 2003 semi-auto air pistol, which fires from the open bolt, there is a backup sear which is operated by the trigger and does not have a disconnector; that sear will catch the bolt in a 90% decocked position. Many pistols have a similar feature, but I'm unaware of any rifles that do. Not sure why such a feature wouldn't be a good idea, since it would enhance drop-safety if nothing else.