Michael Moore got shut down by a gun expert when he made a false statement about the ammunition Omar Mateen used when he opened fire on an Orlando gay club early Sunday morning.

In several tweets Tuesday, the 62-year-old filmmaker said the ammunition used for AR-15s has been banned by the Geneva Convention because it “enters the body, spins & explodes.” Moore said that if photos of the crime scene in Orlando were released, the NRA would be “over.”

Ammo used in AR-15/M-16 is banned by Geneva Convention. It enters the body, spins & explodes. Show the crime scene photos & the NRA is over. — Michael Moore (@MMFlint) June 15, 2016

Any guy who had shop class in high school can change a semi-automatic gun 2 fully automatic in 5min. 4 million “AR-15″/M-16 guns in US homes — Michael Moore (@MMFlint) June 15, 2016

Please stop calling the assault rifle used in Orlando&Newtown the”AR-15″. It is the M-16 weapon we used in Vietnam, modified 4 civilian use. — Michael Moore (@MMFlint) June 15, 2016

Bob Owens — the editor of Bearing Arms — was quick to point out Moore’s mistake. (RELATED: Gun Experts Shut Kirstie Alley Down After She Makes Gun Argument That’s COMPLETELY WRONG)

.@MMFlint You fat, stupid fool. How shall we unpack this? (1) — Bob Owens (@bob_owens) June 15, 2016

.@MMFlint First, the Geneva Conventions don’t address ammunition in any way shape, or form. (2) — Bob Owens (@bob_owens) June 15, 2016

.@MMFlint The Hague Conventions cover the use of different kinds of ammunition. Trade a Big Mac for a book sometime. (3) — Bob Owens (@bob_owens) June 15, 2016

.@MMFlint AR-15s use .223 caliber bullets. The most common are 55-grain solid lead wrapped in copper. They cannot explode. (4) — Bob Owens (@bob_owens) June 15, 2016

.@MMFlint I know that you’re very arrogant, and imagine that you’re just a larger @katiecouric, but not even you can make this lie. (5) — Bob Owens (@bob_owens) June 15, 2016

.@MMFlint If you have a real argument to make based on facts, try it. The fact you grossly lie tells me logic is not on your side. (6) — Bob Owens (@bob_owens) June 15, 2016

.@MMFlint You know what is more powerful and causes more damage than an AR-15 bullet, Mike? Damn near any other rifle bullet. (7) — Bob Owens (@bob_owens) June 15, 2016

.@MMFlint If you were REMOTELY competent or honest, you’d know .223 cartridges are among the smallest of centerfire rifle bullets. (8) — Bob Owens (@bob_owens) June 15, 2016

.@MMFlint In fact, the 55-grain bullet fired by the AR-15 is about 1/3 the weight and less than 1/2 the power of most deer rifles. Oops

(9) — Bob Owens (@bob_owens) June 15, 2016

Moore also called for the removal of all members of Congress who have not supported a bill to ban assault weapons by Friday.