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Late this week I had a package arrive from Dillon Montana. Inside were two receivers I had ordered from them less then 4 weeks ago.
One was one of their M7500 BR receivers which I am going to build a rifle for myself on. THe other was one of the big M8000 receivers designed for the 408 CT case size rounds.
First the M7500.
I have not taken any pics of the receivers yet but will when I get a chance. This receiver has similiar to that of a Nesika Bay M reciever with a 1.350" diameter. A bit longer bolt head, a bit longer receiver thread section.
I ordered this receiver with a left loading port and a right ejection port. This is a solid bottom single shot design. It is also said to be machined to much tighter tolerances then the M7000 receiver and appears to be. This receiver also uses a smaller firing pin diameter as well which will help with high pressure load primer cratering.
I cleaned up the receiver and ran my typical measuring test taking four measurements across the bolt face with the receiver in the bolt locked position. I was very impressed with what I found. All four measurements across the bolt face to the face of the receiver were within 0.00015". EXTREMELY good. Very happy with that result so I moved onto the big M8000 receiver.
This is a BIG receiver. It measures a full 10" in length and is 1.6" in diameter. It has a very large ejection port very well suited for ejecting live cartridges based 408 CT case.
I believe there is also a shorter length receiver which will eject fired cases fine but would require the bolt to be removed to clear a live round. This is easy to do with the side mounted bolt stop lever though.
I got this receiver cleaned up as well and took the same four measurements on this receiver and it came out the same as the M7500 BR receiver right at 0.00015" so again I am very impressed.
For some more comparision, I got two more BAT receivers in shop this week. They measured 0.00015 and 0.00018" variation across the bolt face so basically the two BATS and the M7500 and M8000 Lawton receivers are identical in squareness.
I will get some pics soon.
SO far though, extremely impressed with these receivers. For the money, the M7500 looks like the receiver to beat for anything up to the Lapua class case head sized rounds. Its bolt lugs are significantly longer then the M7000 receiver so they are much stronger and add that significant increase in strength over the M7000 for the big case head wildcats like my 277 and 7mm Allen Mag based on the 338 Lapua.
WOuld also be excellent choice for a 338 Kahn rifle as well.
More information to come.
Kirby Allen(50)
One was one of their M7500 BR receivers which I am going to build a rifle for myself on. THe other was one of the big M8000 receivers designed for the 408 CT case size rounds.
First the M7500.
I have not taken any pics of the receivers yet but will when I get a chance. This receiver has similiar to that of a Nesika Bay M reciever with a 1.350" diameter. A bit longer bolt head, a bit longer receiver thread section.
I ordered this receiver with a left loading port and a right ejection port. This is a solid bottom single shot design. It is also said to be machined to much tighter tolerances then the M7000 receiver and appears to be. This receiver also uses a smaller firing pin diameter as well which will help with high pressure load primer cratering.
I cleaned up the receiver and ran my typical measuring test taking four measurements across the bolt face with the receiver in the bolt locked position. I was very impressed with what I found. All four measurements across the bolt face to the face of the receiver were within 0.00015". EXTREMELY good. Very happy with that result so I moved onto the big M8000 receiver.
This is a BIG receiver. It measures a full 10" in length and is 1.6" in diameter. It has a very large ejection port very well suited for ejecting live cartridges based 408 CT case.
I believe there is also a shorter length receiver which will eject fired cases fine but would require the bolt to be removed to clear a live round. This is easy to do with the side mounted bolt stop lever though.
I got this receiver cleaned up as well and took the same four measurements on this receiver and it came out the same as the M7500 BR receiver right at 0.00015" so again I am very impressed.
For some more comparision, I got two more BAT receivers in shop this week. They measured 0.00015 and 0.00018" variation across the bolt face so basically the two BATS and the M7500 and M8000 Lawton receivers are identical in squareness.
I will get some pics soon.
SO far though, extremely impressed with these receivers. For the money, the M7500 looks like the receiver to beat for anything up to the Lapua class case head sized rounds. Its bolt lugs are significantly longer then the M7000 receiver so they are much stronger and add that significant increase in strength over the M7000 for the big case head wildcats like my 277 and 7mm Allen Mag based on the 338 Lapua.
WOuld also be excellent choice for a 338 Kahn rifle as well.
More information to come.
Kirby Allen(50)
