Here is my approach for strengthening my .22 600mm MK2 crown’s superlight barrel.
The whole construction is similar to the standard liner/sleeve barrels.
I used an aluminum tube with a thickness of 3,5 mm ( O.D. 16 mm and I.D. 9 mm.) these tubes are usually used for making stainless steel look railings.
Extremal threading was made on the back, and the sleeve/tube is now bolted to the shroud cone directly. (The brass retainer and the 5 O-rings are no longer needed)
Internal threading was made in front and now the superior standard liner is secured in place with a new liner locker just like all standard X barrels. Two or three layers of tape around the liner were used for a nice fit inside the tube.
New spacers were made to hold the shroud as the I.D. increased from 8 to 16 mm.
Rigidity of the barrel was much improved. I tested the gun even without the shroud, with a ½ unf silencer bolted and I didn’t notice any significant poi change.
I don’t know if I have improved accuracy noticeably as this gun was already very accurate but with the extra weight in front (no more than 250 grams) feels to me much better. It shoots the same with any good silencer fitted and you don’t have to search for harmonic tunning every time you change power settings. It’s a laser shooting the HN 217/25 at about 915 fps.
Keep in mind that this mod applies only to .177 and .22 as .25 and bigger calibers require larger I.D. sleeve tubes.
The whole construction is similar to the standard liner/sleeve barrels.
I used an aluminum tube with a thickness of 3,5 mm ( O.D. 16 mm and I.D. 9 mm.) these tubes are usually used for making stainless steel look railings.
Extremal threading was made on the back, and the sleeve/tube is now bolted to the shroud cone directly. (The brass retainer and the 5 O-rings are no longer needed)
Internal threading was made in front and now the superior standard liner is secured in place with a new liner locker just like all standard X barrels. Two or three layers of tape around the liner were used for a nice fit inside the tube.
New spacers were made to hold the shroud as the I.D. increased from 8 to 16 mm.
Rigidity of the barrel was much improved. I tested the gun even without the shroud, with a ½ unf silencer bolted and I didn’t notice any significant poi change.
I don’t know if I have improved accuracy noticeably as this gun was already very accurate but with the extra weight in front (no more than 250 grams) feels to me much better. It shoots the same with any good silencer fitted and you don’t have to search for harmonic tunning every time you change power settings. It’s a laser shooting the HN 217/25 at about 915 fps.
Keep in mind that this mod applies only to .177 and .22 as .25 and bigger calibers require larger I.D. sleeve tubes.
