Please remove. Found.

The registration plate on the gun will tell you if it is a G36 or SL-8. If it says SL-8, it is not a G36, no matter how many times you click your heals.

Most of the other parts can be monkeyed about, some easier than others. The barrel is usually a good indicator, but not always. Some of the lower conversions are easier to tell than others.

Some of the internal receiver elements change as well (magwell, trigger area) and modifications are usually obvious. That said, there are some VERY good conversions out there.
 
Yes the registration plate is part of the reciever and yes it can be upgraded. However, when the upgrade is done they intentionally leave the registration plate in tact as it is against the law to mess with the serial number marking. So in short, an SL8 will always say SL8, even after the tbostic conversion. My SL8 says SL8-5 right before the serial number, so unless someone messes with the serial number, the gun will always be marked as an SL8.
 
As already mentioned most obvious will be serial # area ( seen through "window" of SL-8 ) and the "marking plate" . Refer to G36 armourer manual ( if you have it ) on page 13 shows how there is far more info on the marking blate of G36 , such as proof house etc , and serial # ( unlike a SL-8 that has serial # in the window and only says model, caliber, made in bla bla bla )

If you really want to be sure, a FBI lower ( two position semi auto ) still has a " catch" as HK calls it. This is similar to an auto sear in AR . It holds catches the hammer after the sear releases it and only re releases hammer as two "ski bumps" on a G36 bolt carrier trips it as it closes ( as a M16 carrier has the extra meat to trip the auto sear )

So , a semi auto G36 also has a G36 bolt carrier that has these bumps. If you google G36 carrier you will see what I mean. These bumps also preven the installation of a G36 carrier into a SL-8 reciever

Therefore, a real G36 will have a G36 carrier, and two grooves machined down the length of the carrier rails to allow the G36 carrier actually fit

Takes seconds to pull takedown pins to have a peek inside
 
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