Assuming that you have a pre- 09 Atr, the trigger is unadjustable... And you can't get a replacement from mossberg. The trigger pulls on the ATRs are horrible, ranging from 3.5(good) to 8.5(horrible) lbs. Mine breaks at 8 pounds, and there is no way of adjusting it. Believe me, I've tried, and so have gunsmiths.
It is roughly about 300 dollars it is 299.99.
Get an owner's manual from the maker. It may not be user adjustable. It might take a gun smith or factory trained armorer to do it.
Depends on where you currently live, and what stores you have around where you live. But some stores around that i have seen that carry Mossberg 100 ATR 30.06 rifles are Sportsman's Warehouse, Cabela's, Midwest Hunters Outlet, ect.
No, the Gyphon does not have an adjustable trigger
About $450 for rifle scope, sling, and bipod.
Recommend you let a gunsmith do it.
Mine has it.
Best left to a qualified gunsmith
Yes
Not owner adjustable- take it to a gunsmith.
I believe this rifle was made by Mossberg and is the Mossberg 46B. Do a search for photos of the 46B Mossberg to see if it is a match. If so, try Havlin Sales & Service as they may have a replacement trigger guard.
Check Mossberg Customer Service thru their website. They will need the serial number of the gun in question- model changed during production.