Any of the 1Watt and above lasers can burn. Matches and or paper/plastic are no problem.
Matches are instantaneous lid.
As you are new to lasers I suggest reading the safety stickies of the forum. And a protective goggles are also a must.
Lasers are dangerous and you must treat it that way.
1. Yes, the lens barrel has the standard size thread. A replacement lens is very easy.
2. The lens is 445nm AR coated 3-element glass lens and is exchangeable to a G lens.
3. I take PayPal as payment. If you don't like the laser then ship it back and I refund the money. Shipping cost is not refundable.