IOF .22 LR rifle
Posted: Wed May 31, 2006 7:21 pm
Since this is a topic that has come up often but is difficult to search out on the old forum, I was wondering if those who own one or use one at their club would care to talk about. Do mention any modifications you may have made to it.
The following are my views on the subject:
Purchased: 24.8.2004
Cost: Rs.27,000.00 (lesser price due to damaged stock)
Stock: Badly chipped behind the bolt. 'Chequering' was nothing more than irregular diamonds scratched into the pistol grip. No points to the diamonds either. No fore-end chequering. Fore-end tip was painted black to simulate an ebony fore-end tip. Ditto on bottom of pistol grip. Cheap lacquer finish used. Stock re-finished with an oil finish and stippling to pistol grip and fore-end. Inletting was the worst I have ever seen. Inletting smoothened out to some extent (would have liked to do more but was pressed for time) and action was pillar bedded in the absence of glass bedding compound. Barrel was free floated. Action screws replaced at both pillar bedding points with hex bolts which are torqued to 5.5 Nm.
Bolt: Very rough. Bolt rails lapped to make it smoother.
Barrel: Crown had a burr. Re-crowned with a 11 degree target crown. Rifling twist rate is 1 in 200mm (approx. 1 in 8"), 6 grooves. Done on a Steyr Hammer Forging machine. This is a very fast rate of twist for a rimfire. Probably replicated from the Insas 5.56 assault rifle made in the same factory.
Barrel and action: Finished in a hardy military finish. I like this because I find it more practical than bluing.
Magazine: Supposedly a 9 or 10 shot magazine. However the follower spring will need to be cut down as the bolt does not pick up the cartridge if there are more than 5 to 6 rounds in it. External surface is unfinished steel. This was painted after disassembling the magazine. Brno/CZ mags cannot be substituted due to dimensional differences.
Trigger: Excellent! Made better by replacing both hinge pins with the new pins being tighter. This is the exception as all the others I have tried have average triggers.
Rifle does not cycle KF rounds due to their thicker rims. No problem with any other imported round tried to date.
Initial accuracy was poor. Took about 1000+ shots before any sort of respectable groups were possible. It can now manage ?? groups at 50 metres, if I do my bit.
This is a poor copy of the CZ 452. The differences are in the stock, front sight, barrel diameter, slight dimensional differences, finishing and twist rate.
The rifle has now had 2,136 shots through it and the performance is useable to good after the initial problems were attended to.
Would I buy another? Not if I can help it.
Mack The Knife
The following are my views on the subject:
Purchased: 24.8.2004
Cost: Rs.27,000.00 (lesser price due to damaged stock)
Stock: Badly chipped behind the bolt. 'Chequering' was nothing more than irregular diamonds scratched into the pistol grip. No points to the diamonds either. No fore-end chequering. Fore-end tip was painted black to simulate an ebony fore-end tip. Ditto on bottom of pistol grip. Cheap lacquer finish used. Stock re-finished with an oil finish and stippling to pistol grip and fore-end. Inletting was the worst I have ever seen. Inletting smoothened out to some extent (would have liked to do more but was pressed for time) and action was pillar bedded in the absence of glass bedding compound. Barrel was free floated. Action screws replaced at both pillar bedding points with hex bolts which are torqued to 5.5 Nm.
Bolt: Very rough. Bolt rails lapped to make it smoother.
Barrel: Crown had a burr. Re-crowned with a 11 degree target crown. Rifling twist rate is 1 in 200mm (approx. 1 in 8"), 6 grooves. Done on a Steyr Hammer Forging machine. This is a very fast rate of twist for a rimfire. Probably replicated from the Insas 5.56 assault rifle made in the same factory.
Barrel and action: Finished in a hardy military finish. I like this because I find it more practical than bluing.
Magazine: Supposedly a 9 or 10 shot magazine. However the follower spring will need to be cut down as the bolt does not pick up the cartridge if there are more than 5 to 6 rounds in it. External surface is unfinished steel. This was painted after disassembling the magazine. Brno/CZ mags cannot be substituted due to dimensional differences.
Trigger: Excellent! Made better by replacing both hinge pins with the new pins being tighter. This is the exception as all the others I have tried have average triggers.
Rifle does not cycle KF rounds due to their thicker rims. No problem with any other imported round tried to date.
Initial accuracy was poor. Took about 1000+ shots before any sort of respectable groups were possible. It can now manage ?? groups at 50 metres, if I do my bit.
This is a poor copy of the CZ 452. The differences are in the stock, front sight, barrel diameter, slight dimensional differences, finishing and twist rate.
The rifle has now had 2,136 shots through it and the performance is useable to good after the initial problems were attended to.
Would I buy another? Not if I can help it.
Mack The Knife