Trials of the Gehmann ‘zero magnification’ diopter (Pt No. 50300-0 and combined derivatives with iris / optically flat filters etc.) indicate that this device (i) contains multiple lenses and (ii) if used in conjunction with a foresight lens (eagle eye) forms a Galilean telescope. This is currently not permitted under NRA Rules 150 & 207. Furthermore, it permits adjustment to a specification which is not ‘of a similar prescription to that which a competitor would use in everyday use’ which is not permitted under NRA Rule 206
Trials of the Gehmann ‘cylindrical lens system’ (Pt. No. 579) indicate this contains a multiple lens system which permits adjustment to a specification which is not ‘of a similar prescription to that which a competitor would use in everyday use’. Furthermore permission to use a prescription lens in the rear sight must be obtained in advance from the NRA and must be supported by an optometrist’s prescription. This device is therefore not currently permitted under NRA Rule 206
The Shooting Committee has declined to change the Rules governing use of these two devices.
(a) The ‘zero magnification diopter‘ (Pt.No. 50300-1) and its combined derivatives with iris / optically flat filters etc. may only be used with the same restrictions as the conventional variable diopter currently permitted under NRA Rule 150. It may not be used in conjunction with a foresight lens (Eagle Eye).
(b) The ‘cylindrical lens system‘ (Pt. No. 579) is not permitted under NRA Rule 206 and may not be used.
Competitors are reminded of Rule 132 : “It is forbidden to use any artifice that may facilitate shooting which is not expressly permitted by the Rules…….“. Therefore, if you are in any doubt whether use of attachments for your rifle or any other piece of shooting equipment/ accessory / clothing is permitted by the Rules please check with the NRA Office before using it. You will be required to submit details in writing of the ‘artifice’ you propose to use and may be requested to make it available for assessment. A decision as to whether it may be used or otherwise will normally be made within 24 hours.
Group Chief Executive & Secretary General
13 July 2019