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I'm not familiar with mounting them on the M-305, but they are usually avail at most sporting goods/gun shops. SIR in Winnipeg, Wholesale Sports in Edmonton, Bass Pro should have them in Vaughn, Ellwood Epps in Orillia, etc.....
Inlet the stock (under the barrel channel), at the drain hole, for a #2R Harriss Bipod adaptor and glass into place. Istall the stud from the underside.
To mount the stud on my M305, I used the harris adapter for the AR-15. It required a bit of inletting, but the overall fit is awesome. I epoxied it in place and it's like a rock.
Whatever you mount, you'll probably need to inlet it a bit to prevent contact with your op-rod.