Many traditionalists try to use the Two Sword Argument to justify carrying a Glock to Mass:
Then said he unto them: But now he that hath a purse, let him take it, and likewise a scrip; and he that hath not, let him sell his coat, and buy a sword. For I say to you, that this that is written must yet be fulfilled in me: And with the wicked was he reckoned. For the things concerning me have an end. But they said: Lord, behold here are two swords. And he said to them, It is enough. And going out, he went, according to his custom, to the mount of Olives. And his disciples also followed him. LK 22
However this does not help in justifying carrying Guns DURING Mass
First. The two swords belonged to the Householder who supplied Our Lord with everything He needed to say the first Mass.
Second. The mention of the Householders Two Swords took place AFTER the first Mass was finished, and just before Our Lord and Apostles left the Upper Room to go to the farm called Gethsemani:
Lord, behold here are two swords. And he said to them, It is enough. And going out, he went, according to his custom, to the mount of Olives.
Third. Only one of the Householders swords was used by St Peter and that was on the FARM when Our Lord and Apostles were surrounded by enemies.
So NO apostle was carrying a weapon during the first Mass.
The Householder's Two Swords were most likely outside the room where the first Mass took place - on the wall or near the door.
The Householders Two Swords were NOT on any of the Apostles when they received their first Communion.
Again - the Two Swords belonged to the Householder just as did the Chalice and other items needed by Our Lord to say the first Mass.
The Sword was used only on the Farm when surrounded by enemies.
So yes if you want to carry weapons on the farm when surrounded by enemies - go ahead - just don't carrying a weapon during the Holy Sacrifice of the Mass. Weapons do not belong in Church during Mass.
You have no scriptural arguments to defend such folly.